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Start:         2023-07-31 21:56:08
Finished:   2023-07-31 22:06:54

Lab 005: Docker Container Issue

Requirements

There is a static website running within a container named nautilus, this container is running on App Server 1. Suddenly, we started facing some issues with the static website on App Server 1. Look into the issue to fix the same, you can find more details below:

Container's volume /usr/local/apache2/htdocs is mapped with the host's volume /var/www/html.

The website should run on host port 8080 on App Server 1 i.e command curl http://localhost:8080/ should work on App Server 1.

Steps

Login to the app server 1 and switch to root. For the server credentials, check out the Project Nautilus documentation.

sshpass -p  '**********' ssh -o StrictHostKeyChecking=no tony@172.16.238.10
sudo su -
**********

Check the running container and the logs for that container.

[root@stapp01 ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS                     PORTS               NAMES
20d6aeca0505        httpd               "httpd-foreground"   2 minutes ago       Exited (0) 2 minutes ago                       nautilus

[root@stapp01 ~]# docker logs nautilus
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.18.0.2. Set the 'ServerName' directive globally to suppress this message
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.18.0.2. Set the 'ServerName' directive globally to suppress this message
[Mon Jul 31 13:58:17.802472 2023] [mpm_event:notice] [pid 1:tid 140664808155008] AH00489: Apache/2.4.57 (Unix) configured -- resuming normal operations
[Mon Jul 31 13:58:17.802591 2023] [core:notice] [pid 1:tid 140664808155008] AH00094: Command line: 'httpd -D FOREGROUND'
[Mon Jul 31 13:58:17.868002 2023] [mpm_event:notice] [pid 1:tid 140664808155008] AH00492: caught SIGWINCH, shutting down gracefully

We can search online and learn more about this error, or we could simply delete the existing container and run a new container with the exposed ports and correct volume mapping.

[root@stapp01 ~]# docker stop nautilus
nautilus

[root@stapp01 ~]# docker rm nautilus
nautilus

[root@stapp01 ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES 
docker run -d -p 8080:80 --name nautilus -v /var/www/html:/usr/local/apache2/htdocs httpd:latest

Verify.

[root@stapp01 ~]# curl http://localhost:8080/
Welcome to xFusionCorp Industries!

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