Task 17 - Linux Network Services

bagam_fleury · February 28, 2020, 5:35pm

Thanks , but do you have some tutorials or follow documentations ?

shakthiprakash28 · February 28, 2020, 6:55pm

Hi,

Can you confirm on this task? I’ve completed the task successfully but it’s showing failed. Can you check and modify the result for the task according as ive completed the task correctly.

Thanks

bagam_fleury · February 28, 2020, 9:59pm

Inderpreet ,
Can you give some tips to do the assessment on Linux Network services ? I 'm lost and I Don’t anything intersteting on internet to help me . Don’t you have some documentations or relevant tutorials that can help me understanding and fixing this problem ?

Inderpreet · February 29, 2020, 5:31am

Hi @shakthiprakash28

Once you are able to start the Apache service it will be available on same host as its running locally, for example if you have started Apache service on App Server 1 and you try to access Apache from App Server 1 itself it will be available but you need to make sure its available from other hosts as well like jump host.

I hope it clarifies your doubt.

Thanks
Inderpreet

Inderpreet · February 29, 2020, 5:35am

Hi @bagam_fleury

There is no such documentation from our end however you must be able to find relevant solutions on internet if you are clear with the requirements. As mentioned in the question you can use tools like telnet or netstat to identify service reachability and listening ports etc. Since you know well on which port Apache is running or supposed to be running so you can try to start its service and if you face any issues then try to figure out what is causing issues from logs or error messages you see.

Thanks
Inderpreet

kiran · February 29, 2020, 5:01pm

just a clue: did you open the port in iptables on app server to telnet the service from jump box???

shakthiprakash28 · February 29, 2020, 7:48pm

Hi ,

Yes i tried i tried the same as well. Can you give me access to the server again for that task, i can do that again and share the screenshots.

Thanks,

shakthiprakash28 · March 1, 2020, 3:38pm

Hi Inderpreet,

Can you make Task 17 accessible again so that i can complete it again.

Inderpreet · March 2, 2020, 3:52am

Hi @shakthiprakash28

Each failed task will be reassigned aromatically after some time, so please proceed with the next tasks and once you have this one reassigned you can give it an another try.

Thanks
Inderpreet

bagam_fleury · March 2, 2020, 10:14am

Hello Inderpreet ,
I have succeeded to solve the problem regarding apache as you can see on the screenshots , and I have Added some iptables rules on all the servers on the apache’s port .
However , I’m not arriving to access apache on server 1 from jump_host .

Can you help me ?

Inderpreet · March 2, 2020, 10:32am

Hi,

Try to telnet Apache port on App Server 1 from jump host and see if you are able to connect.

Thanks
Inderpreet

bagam_fleury · March 2, 2020, 10:58am

Thanks for your fast reply ,
I have succeeded to ping app server1 from jum host and I don’t understand the reason why it doesn’t work for apache . I will telnet the port as you mentionned .

Inderpreet · March 2, 2020, 11:04am

Hi @bagam_fleury

Ping works on different protocol so if ping works you can’t say Apache will also be reachable. Please try to figure out what exactly you are missing.

maheshb · March 25, 2020, 10:29am

Hi Team,

Please find below output/snippet as a proof saying firewalld service service is up and running and serice is accessible from jumpbox host. Still the result is failed can you tel me whats wrong in it

what does below error mean? as you can clearly see from the above output the firewalld service is active and port is also accessible from jump host

Seem’s like you have stopped iptables firewall service on app server 1.

kaushik · March 25, 2020, 1:22pm

hi @Inderpreet ,
even i’ve got the same error “Seem’s like you have stopped the iptables firewall service on app server 1” . As i can see iptables service was disabled on app server2 and 3 . After fixing httpd service on app server1 . i tried curl from jump host for app server2 and 3 it was working . So i had to stop iptables on appserver1 and tried curling it . it was now working on all the 3 app servers . but task failed . I’m i missing something here ?

Inderpreet · March 25, 2020, 3:33pm

@maheshb Did you install the firewalld on this server ? Also error is mentioning about iptables not firewalld.

Inderpreet · March 25, 2020, 3:35pm

@kaushik

Its never a good idea to stop firewall of any kind if already running on a server as it can be a big security concern.

huseyinkervan · March 25, 2020, 9:30pm

Hi team i thin i solved this problem but i was failed. i add screenshoot but it did not mention about firewall rules so i disable it.

huseyinkervan · March 25, 2020, 9:32pm

i have same issue but there is no warning about iptables and firewall. it can be security issue but this can be useful in internal network sometimes.

pathan.p19 · May 23, 2020, 4:15am

I have updated the firewall rules in the app server, despite that I;m unable to succeed in doing telnet from jumphost to appserver on port 8082

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -s 172.16.238.2/172.16.239.2 -p tcp -m tcp --dport 8082 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8082 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 80 -m conntrack --ctstate ESTABLISHED -j ACCEPT
COMMIT

Completed on Sat May 23 03:51:33 2020

and also dont whats the reason my network service isnt coming up in app server