set up docker and run httpd in 2 vagrant machines. 2

Try docker command

You can search docker image

bash

sudo docker search centos

NAME                           DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
centos                         The official build of CentOS.                   3536      [OK]       
jdeathe/centos-ssh             CentOS-6 6.9 x86_64 / CentOS-7 7.3.1611 x8...   79                   [OK]
tutum/centos                   Simple CentOS docker image with SSH access      33                   
kinogmt/centos-ssh             CentOS with SSH                                 15                   [OK]                

bash

sudo docker pull centos

You can see image in detail

bash

sudo docker inspect centos:latest

bash

sudo docker inspect 36540f

[
    {
        "Id": "sha256:36540f359ca3b021d4b6a37815e9177b6c2bb3817598979ea55aee7ecc5c2c1f",
        "RepoTags": [
            "centos:latest"
        ],
        "RepoDigests": [
            "centos@sha256:c1010e2fe2b635822d99a096b1f4184becf5d1c98707cbccae00be663a9b9131"
        ],
        "Parent": "",
        "Comment": "",

try Hello world

bash

sudo docker run centos echo "hello world"

You can check current container typing this command.

bash

sudo docker ps

There is nothing shown.

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

You can see a past one by using option -a

bash

sudo docker ps -a

Exited (0) means that it finished well

CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS                         PORTS               NAMES
76074bdf7b87        centos              "echo 'hello world'"   3 minutes ago       Exited (0) 3 minutes ago                           upbeat_sammet

You can write it like this

bash

sudo docker ps -a -n=1

You can delete container like this.
76074bdf7b87 is ID

bash

sudo docker rm 76074bdf7b87

You can run free command in background.

bash

sudo docker run -d centos free -s 3

bash

sudo docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e7e5f3d83f76        centos              "free -s 3"         21 seconds ago      Up 20 seconds                           fervent_nobel

You can see logs like this.

bash

sudo docker logs e7e5f3d83f76

              total        used        free      shared  buff/cache   available
Mem:         629984      102056       82684        2884      445244      407420
Swap:       1023996        1920     1022076

You can run this command in foreground.

bash

sudo docker attach --sig-proxy=false e7e5f3d83f76

You can go back by "Ctrl + C"

You can kill process like this.

bash

sudo docker kill e7e5f3d83f76

Check it. no process

bash

sudo docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Check past one.

bash

sudo docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e7e5f3d83f76        centos              "free -s 3"         21 seconds ago      Up 20 seconds                           fervent_nobel

bash

sudo docker start e7e5f3d83f76

Check process

bash

sudo docker ps

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e7e5f3d83f76        centos              "free -s 3"         10 minutes ago      Up 2 seconds                            fervent_nobel

You can check process.

bash

sudo docker top e7e5f3d83f76 ax | unexpand -t20

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