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Managing Multiple Containers Docker

Quick start example

Handbook of commands for managing multiple containers
What we want to achieve:

Run a nginx, MySQL and an apache (httpd) server.
Run all of them --detach and give them a name with --name
nginx should listen on 80:80 httpd on 8080:80 mysql on 3306:3306
Set an --env var to mysql container to pass in MYSQL_RANDOM_ROOT_PASSWORD=yes
Use docker container logs on mysql to find the random password created on startup
Clean all

Let's start ensuring that everything is clean before creating new containers 

sudo docker ps

You should see a table with only the headers and without running containers
Let's create nginx container. 

sudo docker container run --publish 80:80 --detach --name MyNginx nginx

Now you should see the containers running with the sudo docker ps -a
  Now it's time to create our MySQL container 

 sudo docker container run --publish 3306:3306 --detach --env MYSQL_RANDOM_ROOT_PASSWORD="yes" --name MyMySQL mysql

  
Let's read some logs to find out the db psw, first you need to know what is your container's id.
you can find it in the line after your command.
In my case it starts with 4f0
so just type 

sudo docker logs 4f

and search for our password that should look like this
GENERATED ROOT PASSWORD: ox1ju5oMae6paishailoxaeGhe5em8io

Now it's time to create the last container for the httpd service 

sudo docker container run --publish 8080:80 --detach  --name Myhttpd  httpd

It's time to clean up! Now you should have something like this

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                               NAMES
60a26e21a411        httpd               "httpd-foreground"       29 minutes ago      Up 24 seconds       0.0.0.0:8080->80/tcp                Myhttpd
4f053e51ff2c        mysql               "docker-entrypoint.s…"   About an hour ago   Up 16 seconds       0.0.0.0:3306->3306/tcp, 33060/tcp   MyMySQL
9361d770d456        nginx               "nginx -g 'daemon of…"   About an hour ago   Up 3 seconds        0.0.0.0:80->80/tcp                  MyNginx

Now lets simply run sudo docker stop for each container 

chinaski@chinaski-XPS-15-9550:~$ sudo docker stop 60
60
chinaski@chinaski-XPS-15-9550:~$ sudo docker stop 4f
4f
chinaski@chinaski-XPS-15-9550:~$ sudo docker stop 93
93
chinaski@chinaski-XPS-15-9550:~$ sudo docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Fine! Now we have to delete containers
In fact if we add -a flag to ps command we can see that we have only stop containers but they are still present on our system.

chinaski@chinaski-XPS-15-9550:~$ sudo docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
60a26e21a411        httpd               "httpd-foreground"       38 minutes ago      Exited (0) 5 minutes ago                       Myhttpd
4f053e51ff2c        mysql               "docker-entrypoint.s…"   About an hour ago   Exited (0) 5 minutes ago                       MyMySQL
9361d770d456        nginx               "nginx -g 'daemon of…"   About an hour ago   Exited (0) 5 minutes ago                       MyNginx
chinaski@chinaski-XPS-15-9550:~$ sudo docker rm 60
60
chinaski@chinaski-XPS-15-9550:~$ sudo docker rm 4f
4f
chinaski@chinaski-XPS-15-9550:~$ sudo docker rm 93
93

Let's check if everything's gone fine

chinaski@chinaski-XPS-15-9550:~$ sudo docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

MISSION ACCOMPLISHED!


Thanks for your attention!
PS In this tutorial i've run each command without condensed them . But you can also run commands composed like "sudo docker rm firstid secondid ..."

Have a great day!
© Andrea Borio 2018