strange
version: '3'
services:
db:
image: postgres
environment:
- POSTGRES_PASSWORD=mysecretpassword
wordpress:
image: wordpress
ports:
- '8085:80'
links:
- db
I am using depends_on instead of links. I don’t know why its failed at that time.
As far as the info i got from stackoverflow.
“depends-on decides the dependency and the order of container creation and links not only does these, but also containers for the linked service will be reachable at a hostname identical to the alias, or the service name if no alias was specified.”
i.e., with links wordpress will be able to access the database using port exposed in the db image. If depends_on was used, this wouldn’t be possible, but the startup order of the containers would be correct.
It makes sense for the issue here.
@farash ,@Ayman ,@Tej-Singh-Rana
=========================================================================
I used your latest updated file as it is but runs into error .
ERROR: In file ‘./docker-compose.yml’, service must be a mapping, not a NoneType.
$ pwd
/root/wordpress
$ ls
docker-compose.yml$ cat docker-compose.ymlversion: ‘3’
services:
db:
image: postgres
environment:
wordpress:
links:
================= ========================
$ cat docker-compose.yml
version: ‘3’
services:
db:
image: postgres
environment:
- POSTGRES_PASSWORD=mysecretpassword
wordpress:
links:
- db
image: wordpress:latest
ports:
- “8085:80”
$
$
$ docker-compose config
ERROR: In file ‘./docker-compose.yml’, service ‘ports’ must be a mapping not an array.
=============================================================================
I had to fix this error to change ports to direct mapping and not an array.
I did that and ran again Got another error as below
version: ‘3.3’
services: db: image: postgres
environment:
- POSTGRES_PASSWORD=mysecretpassword
wordpress:
links:
- db
image: wordpress:latest
ports: “8085:80”
$
$
$ docker-compose config
ERROR: Version in “./docker-compose.yml” is unsupported. You might be seeing this error because you’re using the wrong Compose file version. Either specify a supported version (e.g"2.2" or “3.3”) and place your service definitions under the services key, or omit the version key and place your service definitions at the root of the file to use version 1.For more on the Compose file format versions, see Overview | Docker Docs
==============================================
I visited this website but could not fix the errors using this guidance to make this running without errors.
=================================================
Below are the outputs of the versions I have captured of docker and platform on kodkloud lab terminal
$docker -v
Docker version 18.09.7, build 2d0083d
$
$
$ cat /etc/release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION=“Ubuntu 16.04.6 LTS”
NAME=“Ubuntu”
VERSION=“16.04.6 LTS (Xenial Xerus)”
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME=“Ubuntu 16.04.6 LTS”
VERSION_ID=“16.04”
HOME_URL=“http://www.ubuntu.com/”
SUPPORT_URL=“http://help.ubuntu.com/”
BUG_REPORT_URL=“Bugs : Ubuntu”
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial
$
$
I am running this in the kodekloud lab platform which is made available to users for doing lab.
Are you running these scripts in exactly same platform by launching the lab of docker-compose ?
If it works at your end can you please also include of
$docker-compose config
$docker-compose up
Thanks for this . I ran this in the kodkloud lab terminal and I did not found any errors for this file .
$ cat docker-compose.yml
version: ‘3’
services:
db:
image: postgres
environment:
- POSTGRES_PASSWORD=mysecretpassword
wordpress:
image: wordpress
ports:
- ‘8085:80’
links:
- db
$
$ docker-compose config
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80/tcp
version: ‘3.0’
$
$ docker-compose up
Creating network “wordpress_default” with the default driver
Creating wordpress_db_1 …
Creating wordpress_db_1 … done
Creating wordpress_wordpress_1 …
Creating wordpress_wordpress_1 … done
Attaching to wordpress_db_1, wordpress_wordpress_1
db_1 | The files belonging to this database system will be owned by user “postgres”.
db_1 | This user must also own the server process.
db_1 |
wordpress_1 | WordPress not found in /var/www/html - copying now…
db_1 | The database cluster will be initialized with locale “en_US.utf8”.
db_1 | The default database encoding has accordingly been set to “UTF8”.
db_1 | The default text search configuration will be set to “english”.
db_1 |
db_1 | Data page checksums are disabled.
db_1 |
db_1 | fixing permissions on existing directory /var/lib/postgresql/data … ok
db_1 | creating subdirectories … ok
db_1 | selecting dynamic shared memory implementation … posix
db_1 | selecting default max_connections … 100
db_1 | selecting default shared_buffers … 128MB
db_1 | selecting default time zone … Etc/UTC
db_1 | creating configuration files … ok
db_1 | running bootstrap script … ok
db_1 | performing post-bootstrap initialization … ok
db_1 | syncing data to disk … ok
db_1 |
db_1 | initdb: warning: enabling “trust” authentication for local connections
db_1 | You can change this by editing pg_hba.conf or using the option -A, or
db_1 | --auth-local and --auth-host, the next time you run initdb.
db_1 |
db_1 | Success. You can now start the database server using:
db_1 |
db_1 | pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1 |
db_1 | waiting for server to start…2020-05-30 08:22:53.465 UTC [45] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-05-30 08:22:53.466 UTC [45] LOG: listening on Unix socket “/var/run/postgresql/.s.PGSQL.5432”
db_1 | 2020-05-30 08:22:53.488 UTC [46] LOG: database system was shut down at 2020-05-30 08:22:53 UTC
db_1 | 2020-05-30 08:22:53.492 UTC [45] LOG: database system is ready to accept connections
wordpress_1 | Complete! WordPress has been successfully copied to /var/www/html
db_1 | done
db_1 | server started
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
db_1 |
db_1 | 2020-05-30 08:22:53.552 UTC [45] LOG: received fast shutdown request
db_1 | waiting for server to shut down…2020-05-30 08:22:53.555 UTC [45] LOG: aborting any active transactions
db_1 | 2020-05-30 08:22:53.557 UTC [45] LOG: background worker “logical replication launcher” (PID 52) exited with exit code 1
db_1 | 2020-05-30 08:22:53.561 UTC [47] LOG: shutting down
db_1 | 2020-05-30 08:22:53.570 UTC [45] LOG: database system is shut down
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | [Sat May 30 08:22:53.648768 2020] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.38 (Debian) PHP/7.3.18 configured – resuming normal operations
wordpress_1 | [Sat May 30 08:22:53.648825 2020] [core:notice] [pid 1] AH00094: Command line: ‘apache2 -D FOREGROUND’
db_1 | done
db_1 | server stopped
db_1 |
db_1 | PostgreSQL init process complete; ready for start up.
db_1 |
db_1 | 2020-05-30 08:22:53.664 UTC [1] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-05-30 08:22:53.664 UTC [1] LOG: listening on IPv4 address “0.0.0.0”, port 5432
db_1 | 2020-05-30 08:22:53.665 UTC [1] LOG: listening on IPv6 address “::”, port 5432
db_1 | 2020-05-30 08:22:53.667 UTC [1] LOG: listening on Unix socket “/var/run/postgresql/.s.PGSQL.5432”
db_1 | 2020-05-30 08:22:53.684 UTC [54] LOG: database system was shut down at 2020-05-30 08:22:53 UTC
db_1 | 2020-05-30 08:22:53.690 UTC [1] LOG: database system is ready to accept connections
I have reversed the order now of your file and tried again i.e. putting wordpress before db in this Yaml file and still it worked .
May because link- takes care to launch the dependancies first before launching wordpress.
There is no issue now.
Only thing I would need to know or find out is what could be summary of learnings or takeaway from all these iterations.
$ pwd
/root/wordpress
$ ls
docker-compose.yml
$ cat docker-compose.yml
version: ‘3’
services:
wordpress:
image: wordpress
ports:
- ‘8085:80’
links:
- db
db:
image: postgres
environment:
- POSTGRES_PASSWORD=mysecretpassword
$
$ docker-compose config
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80/tcp
version: ‘3.0’
$
$
$ docker-compose up
Starting wordpress_db_1 …
Starting wordpress_db_1 … done
Starting wordpress_wordpress_1 …
Starting wordpress_wordpress_1 … done
Attaching to wordpress_db_1, wordpress_wordpress_1
db_1 |
db_1 | PostgreSQL Database directory appears to contain a database; Skipping initialization
db_1 |
db_1 | 2020-05-30 08:56:47.944 UTC [1] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-05-30 08:56:47.945 UTC [1] LOG: listening on IPv4 address “0.0.0.0”, port 5432
db_1 | 2020-05-30 08:56:47.945 UTC [1] LOG: listening on IPv6 address “::”, port 5432
db_1 | 2020-05-30 08:56:47.947 UTC [1] LOG: listening on Unix socket “/var/run/postgresql/.s.PGSQL.5432”
db_1 | 2020-05-30 08:56:47.968 UTC [25] LOG: database system was shut down at 2020-05-30 08:54:34 UTC
db_1 | 2020-05-30 08:56:47.976 UTC [1] LOG: database system is ready to accept connections
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | [Sat May 30 08:56:48.617058 2020] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.38 (Debian) PHP/7.3.18 configured – resuming normal operations
wordpress_1 | [Sat May 30 08:56:48.617170 2020] [core:notice] [pid 1] AH00094: Command line: ‘apache2 -D FOREGROUND’
Indentation error, You are doing syntax error that’s why it’s throwing errors.
@ppnehe @farash @Tej-Singh-Rana
Kindly check the correct code below as I recheck it :
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80
version: '3.0'
Also, check my try below:
Sometimes the correct answer is located under path /var/answers/ as you can find the above answer inside it.
We do sorry for any inconvenience.
I hope this helps!
Thank you Sir @Ayman
I have verified this yml code and this one works absolutely fine without any issues.
This passes all of the verification checks scripted at the end of the docker-compose lab
Also thank you for the hint on to verify right answers under /var
with best regards
Pradeep Nehe
$ pwd
/root/wordpress
$
$ cat docker-compose.yml
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80
version: ‘3.0’
$
$ docker-compose config
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80/tcp
version: ‘3.0’
$
$ docker-compose up
Creating network “wordpress_default” with the default driver
Creating wordpress_db_1 …
Creating wordpress_db_1 … done
Creating wordpress_wordpress_1 …
Creating wordpress_wordpress_1 … done
Attaching to wordpress_db_1, wordpress_wordpress_1
db_1 | The files belonging to this database system will be owned by user “postgres”.
db_1 | This user must also own the server process.
db_1 |
db_1 | The database cluster will be initialized with locale “en_US.utf8”.
db_1 | The default database encoding has accordingly been set to “UTF8”.
db_1 | The default text search configuration will be set to “english”.
db_1 |
db_1 | Data page checksums are disabled.
db_1 |
db_1 | fixing permissions on existing directory /var/lib/postgresql/data … ok
db_1 | creating subdirectories … ok
db_1 | selecting dynamic shared memory implementation … posix
db_1 | selecting default max_connections … 100
db_1 | selecting default shared_buffers … 128MB
db_1 | selecting default time zone … Etc/UTC
db_1 | creating configuration files … ok
db_1 | running bootstrap script … ok
db_1 | performing post-bootstrap initialization … ok
wordpress_1 | WordPress not found in /var/www/html - copying now…
db_1 | syncing data to disk … ok
db_1 |
db_1 |
db_1 | Success. You can now start the database server using:
db_1 |
db_1 | pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1 |
db_1 | initdb: warning: enabling “trust” authentication for local connections
db_1 | You can change this by editing pg_hba.conf or using the option -A, or
db_1 | --auth-local and --auth-host, the next time you run initdb.
db_1 | waiting for server to start…2020-06-04 10:14:19.845 UTC [45] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-06-04 10:14:19.846 UTC [45] LOG: listening on Unix socket “/var/run/postgresql/.s.PGSQL.5432”
db_1 | 2020-06-04 10:14:19.859 UTC [46] LOG: database system was shut down at 2020-06-04 10:14:19 UTC
db_1 | 2020-06-04 10:14:19.865 UTC [45] LOG: database system is ready to accept connections
db_1 | done
db_1 | server started
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
db_1 |
db_1 | 2020-06-04 10:14:19.937 UTC [45] LOG: received fast shutdown request
wordpress_1 | Complete! WordPress has been successfully copied to /var/www/html
db_1 | waiting for server to shut down…2020-06-04 10:14:19.941 UTC [45] LOG: aborting any active transactions
db_1 | 2020-06-04 10:14:19.942 UTC [45] LOG: background worker “logical replication launcher” (PID 52) exited with exit code 1
db_1 | 2020-06-04 10:14:19.945 UTC [47] LOG: shutting down
db_1 | 2020-06-04 10:14:19.955 UTC [45] LOG: database system is shut down
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 172.19.0.3. Set the ‘ServerName’ directive globally to suppress this message
wordpress_1 | [Thu Jun 04 10:14:20.039469 2020] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.38 (Debian) PHP/7.3.18 configured – resuming normal operations
wordpress_1 | [Thu Jun 04 10:14:20.039515 2020] [core:notice] [pid 1] AH00094: Command line: ‘apache2 -D FOREGROUND’
db_1 | done
db_1 | server stopped
db_1 |
db_1 | PostgreSQL init process complete; ready for start up.
db_1 |
db_1 | 2020-06-04 10:14:20.056 UTC [1] LOG: starting PostgreSQL 12.3 (Debian 12.3-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-06-04 10:14:20.057 UTC [1] LOG: listening on IPv4 address “0.0.0.0”, port 5432
db_1 | 2020-06-04 10:14:20.057 UTC [1] LOG: listening on IPv6 address “::”, port 5432
db_1 | 2020-06-04 10:14:20.059 UTC [1] LOG: listening on Unix socket “/var/run/postgresql/.s.PGSQL.5432”
db_1 | 2020-06-04 10:14:20.073 UTC [54] LOG: database system was shut down at 2020-06-04 10:14:19 UTC
db_1 | 2020-06-04 10:14:20.077 UTC [1] LOG: database system is ready to accept connections
Hi @goel.umang7
Please check the response from @Ayman on same thread.
This script worked for us and it passes all checks scripted at the verification stages of this lab.
===============================================================
$ cat docker-compose.yml
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80
version: ‘3.0’
$
=============================================================
Thanks Everyone for helping out in this issue.
Hi everyone,
I’m facing the same issue , and apparently, is the same solution that was provided by @Ayman:
Any help is welcome, thanks
I just ran this again and I am too exactly getting same FAIL checks in verification stages.
I am not able to see any errors . I have attached below outputs to help us improve our troubleshooting skills.
Based on docker network ls , docker network inspect and docker container inspect commands it appears that both the containers are in same network 172.19.0.0/16
Can you please guide us based on below output
What more troubleshooting commands and steps we need to take ?
Where else to look for the errors ?
As I am using file same as from /var/asnwers/answers.txt I am assuming there are no changes made to that file when it ran last time successfully couple of weeks ago.
$ pwd
/root/wordpress
$
$ ls -al
total 12
drwxr-xr-x 2 root root 4096 Jun 13 00:53 .
drwx------ 5 root root 4096 Jun 13 00:53 …
-rw-r–r-- 1 root root 189 Jun 13 00:53 docker-compose.yml
$
$
$ cat docker-compose.yml
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80
version: ‘3.0’
$
$ docker-compose config
services:
db:
environment:
POSTGRES_PASSWORD: mysecretpassword
image: postgres
wordpress:
image: wordpress
links:
- db
ports:
- 8085:80/tcp
version: ‘3.0’
$
$
$ docker-compose up -d
Creating wordpress_db_1 …
Creating wordpress_db_1 … done
Creating wordpress_wordpress_1 …
Creating wordpress_wordpress_1 … done
$
$
$
$
$ docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e62d05a2818e wordpress “docker-entrypoint.s…” 28 seconds ago Up 27 seconds 0.0.0.0:8085->80/tcp wordpress_wordpress_1
2a1038f5740e postgres “docker-entrypoint.s…” 29 seconds ago Up 27 seconds 5432/tcp wordpress_db_1
$
$
$ docker network ls
NETWORK ID NAME DRIVER SCOPE
88e4e1c90c31 bridge bridge local
25818271944e host host local
fe6f1f6a903a none null local
0fa4d0a856d3 wordpress_default bridge local
$
$
$ docker network inspect 0f
[
{
“Name”: “wordpress_default”,
“Id”: “0fa4d0a856d33b2394cd9687af548bed791c649ccdb1e6eb67cfef253d297138”,
“Created”: “2020-06-13T00:53:48.157901239Z”,
“Scope”: “local”,
“Driver”: “bridge”,
“EnableIPv6”: false,
“IPAM”: {
“Driver”: “default”,
“Options”: null,
“Config”: [
{
“Subnet”: “172.19.0.0/16”,
“Gateway”: “172.19.0.1”
}
]
},
“Internal”: false,
“Attachable”: true,
“Ingress”: false,
“ConfigFrom”: {
“Network”: “”
},
“ConfigOnly”: false,
“Containers”: {
“2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42”: {
“Name”: “wordpress_db_1”,
“EndpointID”: “7a0eacde45d8ddf8c919790039d42878984c427305f98bb1d0e43bcb55e38048”,
“MacAddress”: “02:42:ac:13:00:02”,
“IPv4Address”: “172.19.0.2/16”,
“IPv6Address”: “”
},
“e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6”: {
“Name”: “wordpress_wordpress_1”,
“EndpointID”: “39d352a6177a0d5b3d15cc8abc2c8f802ce8baa3ca1704d10e5aad7a777cc2f9”,
“MacAddress”: “02:42:ac:13:00:03”,
“IPv4Address”: “172.19.0.3/16”,
“IPv6Address”: “”
}
},
“Options”: {},
“Labels”: {
“com.docker.compose.network”: “default”,
“com.docker.compose.project”: “wordpress”
}
}
]
$
$
$ docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e62d05a2818e wordpress “docker-entrypoint.s…” 59 seconds ago Up 58 seconds 0.0.0.0:8085->80/tcp wordpress_wordpress_1
2a1038f5740e postgres “docker-entrypoint.s…” About a minute ago Up 59 seconds 5432/tcp wordpress_db_1
$
$ docker container inspect e62
[
{
“Id”: “e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6”,
“Created”: “2020-06-13T01:23:24.560492734Z”,
“Path”: “docker-entrypoint.sh”,
“Args”: [
“apache2-foreground”
],
“State”: {
“Status”: “running”,
“Running”: true,
“Paused”: false,
“Restarting”: false,
“OOMKilled”: false,
“Dead”: false,
“Pid”: 6244,
“ExitCode”: 0,
“Error”: “”,
“StartedAt”: “2020-06-13T01:23:25.146366232Z”,
“FinishedAt”: “0001-01-01T00:00:00Z”
},
“Image”: “sha256:2c9350d16623803c9bcfa58973b9bdba18e06d3107b15ba8090c09db946c27bf”,
“ResolvConfPath”: “/var/lib/docker/containers/e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6/resolv.conf”,
“HostnamePath”: “/var/lib/docker/containers/e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6/hostname”,
“HostsPath”: “/var/lib/docker/containers/e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6/hosts”,
“LogPath”: “/var/lib/docker/containers/e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6/e62d05a2818ea0962042ab4e1f00a17f1e79b6ffeef324a945af476f8c0b71f6-json.log”,
“Name”: “/wordpress_wordpress_1”,
“RestartCount”: 0,
“Driver”: “overlay”,
“Platform”: “linux”,
“MountLabel”: “”,
“ProcessLabel”: “”,
“AppArmorProfile”: “docker-default”,
“ExecIDs”: null,
“HostConfig”: {
“Binds”: [],
“ContainerIDFile”: “”,
“LogConfig”: {
“Type”: “json-file”,
“Config”: {}
},
“NetworkMode”: “wordpress_default”,
“PortBindings”: {
“80/tcp”: [
{
“HostIp”: “”,
“HostPort”: “8085”
}
]
},
“RestartPolicy”: {
“Name”: “”,
“MaximumRetryCount”: 0
},
“AutoRemove”: false,
“VolumeDriver”: “”,
“VolumesFrom”: [],
“CapAdd”: null,
“CapDrop”: null,
“Dns”: null,
“DnsOptions”: null,
“DnsSearch”: null,
“ExtraHosts”: null,
“GroupAdd”: null,
“IpcMode”: “shareable”,
“Cgroup”: “”,
“Links”: null,
“OomScoreAdj”: 0,
“PidMode”: “”,
“Privileged”: false,
“PublishAllPorts”: false,
“ReadonlyRootfs”: false,
“SecurityOpt”: null,
“UTSMode”: “”,
“UsernsMode”: “”,
“ShmSize”: 67108864,
“Runtime”: “runc”,
“ConsoleSize”: [
0,
0
],
“Isolation”: “”,
“CpuShares”: 0,
“Memory”: 0,
“NanoCpus”: 0,
“CgroupParent”: “”,
“BlkioWeight”: 0,
“BlkioWeightDevice”: null,
“BlkioDeviceReadBps”: null,
“BlkioDeviceWriteBps”: null,
“BlkioDeviceReadIOps”: null,
“BlkioDeviceWriteIOps”: null,
“CpuPeriod”: 0,
“CpuQuota”: 0,
“CpuRealtimePeriod”: 0,
“CpuRealtimeRuntime”: 0,
“CpusetCpus”: “”,
“CpusetMems”: “”,
“Devices”: null,
“DeviceCgroupRules”: null,
“DiskQuota”: 0,
“KernelMemory”: 0,
“MemoryReservation”: 0,
“MemorySwap”: 0,
“MemorySwappiness”: null,
“OomKillDisable”: false,
“PidsLimit”: 0,
“Ulimits”: null,
“CpuCount”: 0,
“CpuPercent”: 0,
“IOMaximumIOps”: 0,
“IOMaximumBandwidth”: 0,
“MaskedPaths”: [
“/proc/asound”,
“/proc/acpi”,
“/proc/kcore”,
“/proc/keys”,
“/proc/latency_stats”,
“/proc/timer_list”,
“/proc/timer_stats”,
“/proc/sched_debug”,
“/proc/scsi”,
“/sys/firmware”
],
“ReadonlyPaths”: [
“/proc/bus”,
“/proc/fs”,
“/proc/irq”,
“/proc/sys”,
“/proc/sysrq-trigger”
]
},
“GraphDriver”: {
“Data”: {
“LowerDir”: “/var/lib/docker/overlay/94005bd4b5e89b71c6fc96092d5202106afbab95304919c36ec566cd4db0e802/root”,
“MergedDir”: “/var/lib/docker/overlay/53ba1589093f9c06b3f92aa984887beba5cafe89062a18520f3e490ca03f1e70/merged”,
“UpperDir”: “/var/lib/docker/overlay/53ba1589093f9c06b3f92aa984887beba5cafe89062a18520f3e490ca03f1e70/upper”,
“WorkDir”: “/var/lib/docker/overlay/53ba1589093f9c06b3f92aa984887beba5cafe89062a18520f3e490ca03f1e70/work”
},
“Name”: “overlay”
},
“Mounts”: [
{
“Type”: “volume”,
“Name”: “c709901c6561c3d7fc2794283be93e713b104fd3c63d86de700135a78daeff63”,
“Source”: “/var/lib/docker/volumes/c709901c6561c3d7fc2794283be93e713b104fd3c63d86de700135a78daeff63/_data”,
“Destination”: “/var/www/html”,
“Driver”: “local”,
“Mode”: “”,
“RW”: true,
“Propagation”: “”
}
],
“Config”: {
“Hostname”: “e62d05a2818e”,
“Domainname”: “”,
“User”: “”,
“AttachStdin”: false,
“AttachStdout”: false,
“AttachStderr”: false,
“ExposedPorts”: {
“80/tcp”: {}
},
“Tty”: false,
“OpenStdin”: false,
“StdinOnce”: false,
“Env”: [
“PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin”,
“PHPIZE_DEPS=autoconf \t\tdpkg-dev \t\tfile \t\tg++ \t\tgcc \t\tlibc-dev \t\tmake \t\tpkg-config \t\tre2c”,
“PHP_INI_DIR=/usr/local/etc/php”,
“APACHE_CONFDIR=/etc/apache2”,
“APACHE_ENVVARS=/etc/apache2/envvars”,
“PHP_EXTRA_BUILD_DEPS=apache2-dev”,
“PHP_EXTRA_CONFIGURE_ARGS=–with-apxs2 --disable-cgi”,
“PHP_CFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64”,
“PHP_CPPFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64”,
“PHP_LDFLAGS=-Wl,-O1 -pie”,
“GPG_KEYS=CBAF69F173A0FEA4B537F470D66C9593118BCCB6 F38252826ACD957EF380D39F2F7956BC5DA04B5D”,
“PHP_VERSION=7.3.19”,
“PHP_URL=https://www.php.net/distributions/php-7.3.19.tar.xz”,
“PHP_ASC_URL=https://www.php.net/distributions/php-7.3.19.tar.xz.asc”,
“PHP_SHA256=6402faa19b1a8c4317c7612632bce985684a5bbae0980a5779a4019439882422”,
“PHP_MD5=”,
“WORDPRESS_VERSION=5.4.2”,
“WORDPRESS_SHA1=e5631f812232fbd45d3431783d3db2e0d5670d2d”
],
“Cmd”: [
“apache2-foreground”
],
“ArgsEscaped”: true,
“Image”: “wordpress”,
“Volumes”: {
“/var/www/html”: {}
},
“WorkingDir”: “/var/www/html”,
“Entrypoint”: [
“docker-entrypoint.sh”
],
“OnBuild”: null,
“Labels”: {
“com.docker.compose.config-hash”: “3c6abed06257bbfc34b5e3d5522d06897757e91a2d2016da717b8ea8dbdd1c85”,
“com.docker.compose.container-number”: “1”,
“com.docker.compose.oneoff”: “False”,
“com.docker.compose.project”: “wordpress”,
“com.docker.compose.service”: “wordpress”,
“com.docker.compose.version”: “1.16.1”
},
“StopSignal”: “SIGWINCH”
},
“NetworkSettings”: {
“Bridge”: “”,
“SandboxID”: “132c5c9b18158359cd2e9c848b819cbae4c87916c1216d026036d3a3fb834544”,
“HairpinMode”: false,
“LinkLocalIPv6Address”: “”,
“LinkLocalIPv6PrefixLen”: 0,
“Ports”: {
“80/tcp”: [
{
“HostIp”: “0.0.0.0”,
“HostPort”: “8085”
}
]
},
“SandboxKey”: “/var/run/docker/netns/132c5c9b1815”,
“SecondaryIPAddresses”: null,
“SecondaryIPv6Addresses”: null,
“EndpointID”: “”,
“Gateway”: “”,
“GlobalIPv6Address”: “”,
“GlobalIPv6PrefixLen”: 0,
“IPAddress”: “”,
“IPPrefixLen”: 0,
“IPv6Gateway”: “”,
“MacAddress”: “”,
“Networks”: {
“wordpress_default”: {
“IPAMConfig”: null,
“Links”: [
“wordpress_db_1:db”,
“wordpress_db_1:db_1”,
“wordpress_db_1:wordpress_db_1”
],
“Aliases”: [
“wordpress”,
“e62d05a2818e”
],
“NetworkID”: “0fa4d0a856d33b2394cd9687af548bed791c649ccdb1e6eb67cfef253d297138”,
“EndpointID”: “39d352a6177a0d5b3d15cc8abc2c8f802ce8baa3ca1704d10e5aad7a777cc2f9”,
“Gateway”: “172.19.0.1”,
“IPAddress”: “172.19.0.3”,
“IPPrefixLen”: 16,
“IPv6Gateway”: “”,
“GlobalIPv6Address”: “”,
“GlobalIPv6PrefixLen”: 0,
“MacAddress”: “02:42:ac:13:00:03”,
“DriverOpts”: null
}
}
}
}
]
$
$ docker container inspect 2a1
[
{
“Id”: “2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42”,
“Created”: “2020-06-13T01:23:23.951818347Z”,
“Path”: “docker-entrypoint.sh”,
“Args”: [
“postgres”
],
“State”: {
“Status”: “running”,
“Running”: true,
“Paused”: false,
“Restarting”: false,
“OOMKilled”: false,
“Dead”: false,
“Pid”: 6077,
“ExitCode”: 0,
“Error”: “”,
“StartedAt”: “2020-06-13T01:23:24.512991739Z”,
“FinishedAt”: “0001-01-01T00:00:00Z”
},
“Image”: “sha256:b97bae343e06e050f84c781eee8a9d6b0688b8bbdcc0161990573c194b333479”,
“ResolvConfPath”: “/var/lib/docker/containers/2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42/resolv.conf”,
“HostnamePath”: “/var/lib/docker/containers/2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42/hostname”,
“HostsPath”: “/var/lib/docker/containers/2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42/hosts”,
“LogPath”: “/var/lib/docker/containers/2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42/2a1038f5740ea1a116adbb3d2e2bbd229e5083c879833f4373bbd4606073bc42-json.log”,
“Name”: “/wordpress_db_1”,
“RestartCount”: 0,
“Driver”: “overlay”,
“Platform”: “linux”,
“MountLabel”: “”,
“ProcessLabel”: “”,
“AppArmorProfile”: “docker-default”,
“ExecIDs”: null,
“HostConfig”: {
“Binds”: [],
“ContainerIDFile”: “”,
“LogConfig”: {
“Type”: “json-file”,
“Config”: {}
},
“NetworkMode”: “wordpress_default”,
“PortBindings”: {},
“RestartPolicy”: {
“Name”: “”,
“MaximumRetryCount”: 0
},
“AutoRemove”: false,
“VolumeDriver”: “”,
“VolumesFrom”: [],
“CapAdd”: null,
“CapDrop”: null,
“Dns”: null,
“DnsOptions”: null,
“DnsSearch”: null,
“ExtraHosts”: null,
“GroupAdd”: null,
“IpcMode”: “shareable”,
“Cgroup”: “”,
“Links”: null,
“OomScoreAdj”: 0,
“PidMode”: “”,
“Privileged”: false,
“PublishAllPorts”: false,
“ReadonlyRootfs”: false,
“SecurityOpt”: null,
“UTSMode”: “”,
“UsernsMode”: “”,
“ShmSize”: 67108864,
“Runtime”: “runc”,
“ConsoleSize”: [
0,
0
],
“Isolation”: “”,
“CpuShares”: 0,
“Memory”: 0,
“NanoCpus”: 0,
“CgroupParent”: “”,
“BlkioWeight”: 0,
“BlkioWeightDevice”: null,
“BlkioDeviceReadBps”: null,
“BlkioDeviceWriteBps”: null,
“BlkioDeviceReadIOps”: null,
“BlkioDeviceWriteIOps”: null,
“CpuPeriod”: 0,
“CpuQuota”: 0,
“CpuRealtimePeriod”: 0,
“CpuRealtimeRuntime”: 0,
“CpusetCpus”: “”,
“CpusetMems”: “”,
“Devices”: null,
“DeviceCgroupRules”: null,
“DiskQuota”: 0,
“KernelMemory”: 0,
“MemoryReservation”: 0,
“MemorySwap”: 0,
“MemorySwappiness”: null,
“OomKillDisable”: false,
“PidsLimit”: 0,
“Ulimits”: null,
“CpuCount”: 0,
“CpuPercent”: 0,
“IOMaximumIOps”: 0,
“IOMaximumBandwidth”: 0,
“MaskedPaths”: [
“/proc/asound”,
“/proc/acpi”,
“/proc/kcore”,
“/proc/keys”,
“/proc/latency_stats”,
“/proc/timer_list”,
“/proc/timer_stats”,
“/proc/sched_debug”,
“/proc/scsi”,
“/sys/firmware”
],
“ReadonlyPaths”: [
“/proc/bus”,
“/proc/fs”,
“/proc/irq”,
“/proc/sys”,
“/proc/sysrq-trigger”
]
},
“GraphDriver”: {
“Data”: {
“LowerDir”: “/var/lib/docker/overlay/b2a34bfa6639c266d52d2fb21bde48339ba009a5cf87e3a47295b4db1f4a11f7/root”,
“MergedDir”: “/var/lib/docker/overlay/1c6fe784a79e70218fc7f5bec4b6ca510ad223e0f38d873c100df789e14af457/merged”,
“UpperDir”: “/var/lib/docker/overlay/1c6fe784a79e70218fc7f5bec4b6ca510ad223e0f38d873c100df789e14af457/upper”,
“WorkDir”: “/var/lib/docker/overlay/1c6fe784a79e70218fc7f5bec4b6ca510ad223e0f38d873c100df789e14af457/work”
},
“Name”: “overlay”
},
“Mounts”: [
{
“Type”: “volume”,
“Name”: “242de1cf2af3b2d9bbf4f7f8954ec61198900fc0fff54613719098b9ab56d458”,
“Source”: “/var/lib/docker/volumes/242de1cf2af3b2d9bbf4f7f8954ec61198900fc0fff54613719098b9ab56d458/_data”,
“Destination”: “/var/lib/postgresql/data”,
“Driver”: “local”,
“Mode”: “”,
“RW”: true,
“Propagation”: “”
}
],
“Config”: {
“Hostname”: “2a1038f5740e”,
“Domainname”: “”,
“User”: “”,
“AttachStdin”: false,
“AttachStdout”: false,
“AttachStderr”: false,
“ExposedPorts”: {
“5432/tcp”: {}
},
“Tty”: false,
“OpenStdin”: false,
“StdinOnce”: false,
“Env”: [
“POSTGRES_PASSWORD=mysecretpassword”,
“PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/postgresql/12/bin”,
“GOSU_VERSION=1.12”,
“LANG=en_US.utf8”,
“PG_MAJOR=12”,
“PG_VERSION=12.3-1.pgdg100+1”,
“PGDATA=/var/lib/postgresql/data”
],
“Cmd”: [
“postgres”
],
“ArgsEscaped”: true,
“Image”: “postgres”,
“Volumes”: {
“/var/lib/postgresql/data”: {}
},
“WorkingDir”: “”,
“Entrypoint”: [
“docker-entrypoint.sh”
],
“OnBuild”: null,
“Labels”: {
“com.docker.compose.config-hash”: “4f299f4dcdd14d3f6993f758213d49dbcd0a367ec89c0b24ef4168e4385f246f”,
“com.docker.compose.container-number”: “1”,
“com.docker.compose.oneoff”: “False”,
“com.docker.compose.project”: “wordpress”,
“com.docker.compose.service”: “db”,
“com.docker.compose.version”: “1.16.1”
}
},
“NetworkSettings”: {
“Bridge”: “”,
“SandboxID”: “4add2ea48402b562649261bfd00e14e80ffeb78fa1ee44fdff6331afe8db7aa9”,
“HairpinMode”: false,
“LinkLocalIPv6Address”: “”,
“LinkLocalIPv6PrefixLen”: 0,
“Ports”: {
“5432/tcp”: null
},
“SandboxKey”: “/var/run/docker/netns/4add2ea48402”,
“SecondaryIPAddresses”: null,
“SecondaryIPv6Addresses”: null,
“EndpointID”: “”,
“Gateway”: “”,
“GlobalIPv6Address”: “”,
“GlobalIPv6PrefixLen”: 0,
“IPAddress”: “”,
“IPPrefixLen”: 0,
“IPv6Gateway”: “”,
“MacAddress”: “”,
“Networks”: {
“wordpress_default”: {
“IPAMConfig”: null,
“Links”: null,
“Aliases”: [
“2a1038f5740e”,
“db”
],
“NetworkID”: “0fa4d0a856d33b2394cd9687af548bed791c649ccdb1e6eb67cfef253d297138”,
“EndpointID”: “7a0eacde45d8ddf8c919790039d42878984c427305f98bb1d0e43bcb55e38048”,
“Gateway”: “172.19.0.1”,
“IPAddress”: “172.19.0.2”,
“IPPrefixLen”: 16,
“IPv6Gateway”: “”,
“GlobalIPv6Address”: “”,
“GlobalIPv6PrefixLen”: 0,
“MacAddress”: “02:42:ac:13:00:02”,
“DriverOpts”: null
}
}
}
}
]
$
$
We will fix it and keep you updated ASAP.
Hi @Ayman
Thanks for your quick reply and stepping in to provide the fix.
It would profit more to guide us how can we students can approach a problems like this on our own and what next steps we can take to improve troubleshooting and debugging skills to next level.
ex
docker container ls
docker network ls
docker network inspect network_id
docker container inspect container_id
docker-compose config
Is there anything like systemctl / journal log file inspection possible in these containers ? Hpw to use those commands
What are the other areas to look for ?
ex
whether both the containers are in same network or no by inspecting their IP address
whether both the containers have same default gateway as it appears to be correct
whether link is defined in yaml code which appears as present
whether link is really established once containers are created and why
Is there any authentication issue between the two containers . How to find it ?
How to take forward debugging to next level.
Your guidance will help us more than the fix in our own realtime environment and docker learning journey.
with best regards
Pradeep Nehe
In last tab (05) there is no detailed description about specs for containers. Please add them.
My Docker-compose.yml file:
version: “3”
services:
wordpress:
image: wordpress
ports:
- 8085:80
links:
- “db”
db:
image: postgres
environment:
- POSTGRES_PASSWORD=“mysecretpassword”
All checks passed except: WordPress linked to db container
In Version 3 of Docker Compose we do not need links at all as far as I know but I have added it explicitly. Docker-compose up works, but cannot connect to database during wordpress setup
I used following:
database: wordpress
user: postgres
password: mysecretpassword
host: db
Any idea ?
Hi @andrzej
Do you mean output needed of
docker container inspect container_ID from both the containers in addition to above ?
with best regards
Pradeep Nehe
Sorry did not get what do you mean.
