Docker - force delete all containers or images


  • Force rm containers: docker container rm ${docker container ls -aq} -f
# Here is container
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
c1b65461eefd        nginx               "nginx -g 'daemon of…"   4 days ago          Up 4 days           0.0.0.0:1234->80/tcp   webwww

# container ls -aq can show container id
isaac@isaac-KVM:~$ docker container ls -aq
c1b65461eefd

# Force remove container by query container id
isaac@isaac-KVM:~$ docker container rm $(docker container ls -aq) -f
c1b65461eefd

# Confirmed container doesn't exist
isaac@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
isaac@isaac-KVM:~$

  • Force rm images
# There are images
isaac@isaac-KVM:~$ docker image ls -a
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              719cd2e3ed04        2 months ago        109MB
ubuntu              latest              7698f282e524        3 months ago        69.9MB

# List image ids
isaac@isaac-KVM:~$ docker image ls -aq
719cd2e3ed04
7698f282e524

# Force remove all images
isaac@isaac-KVM:~$ docker image rm $(docker image ls -aq) -f
Untagged: nginx:latest
Untagged: nginx@sha256:bdbf36b7f1f77ffe7bd2a32e59235dff6ecf131e3b6b5b96061c652f30685f3a
Deleted: sha256:719cd2e3ed04781b11ed372ec8d712fac66d5b60a6fb6190bf76b7d18cb50105
Deleted: sha256:e9b6506fb887de50972aefd99d7c5eb56b1a8e757ed953cdfecb86b5359bcb22
Deleted: sha256:55d9d9692a9615a28d183a42bc3881a72a39393feba3664e669e7affb78daa76
Deleted: sha256:cf5b3c6798f77b1f78bf4e297b27cfa5b6caa982f04caeb5de7d13c255fd7a1e
Untagged: ubuntu:latest
Untagged: ubuntu@sha256:f08638ec7ddc90065187e7eabdfac3c96e5ff0f6b2f1762cf31a4f49b53000a5
Deleted: sha256:7698f282e5242af2b9d2291458d4e425c75b25b0008c1e058d66b717b4c06fa9
Deleted: sha256:027b23fdf3957673017df55aa29d754121aee8a7ed5cc2898856f898e9220d2c
Deleted: sha256:0dfbdc7dee936a74958b05bc62776d5310abb129cfde4302b7bcdf0392561496
Deleted: sha256:02571d034293cb241c078d7ecbf7a84b83a5df2508f11a91de26ec38eb6122f1

# Confirm all images don't exist
isaac@isaac-KVM:~$ docker image ls -a
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
isaac@isaac-KVM:~$


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Docker - Inspect image: understand the default command of an image

  • Inspect an image can understand what command will be executed by default

docker image inspect ubuntu
[
    {
        "Id": "sha256:a2a15febcdf362f6115e801d37b5e60d6faaeedcb9896155e5fe9d754025be12",
        "RepoTags": [
            "ubuntu:latest"
        ],
        "RepoDigests": [
            "ubuntu@sha256:d1d454df0f579c6be4d8161d227462d69e163a8ff9d20a847533989cf0c94d90"
        ],
        "Parent": "",
        "Comment": "",
        "Created": "2019-08-15T07:28:14.830150536Z",
        "Container": "41b694b9b42f9c5ef7fb40c24272927a727a6d6cb8120bb3eae5849ceb9bee77",
        "ContainerConfig": {
            "Hostname": "41b694b9b42f",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/sh",
                "-c",
                "#(nop) ",
                "CMD [\"/bin/bash\"]"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:bcbe079849fdbb50b3eb04798547e046bdbc82020b8b780d767cf29f7e60b396",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {}
        },
        "DockerVersion": "18.06.1-ce",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/bash"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:bcbe079849fdbb50b3eb04798547e046bdbc82020b8b780d767cf29f7e60b396",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 64185488,
        "VirtualSize": 64185488,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/b6f45f91ad1f6356deb2c2ab3d04305cfcf0a5eedd3fed58e7059f901fbf6c4d/diff:/var/lib/docker/overlay2/dd6b618cd5cb79f5e029942234a1aeadead024082bade5bd2321e77eb504d6f1/diff:/var/lib/docker/overlay2/0fec4af91d36748a2b39c11fcd7f73bc015144ea28c7ff4234948d97e5d839b2/diff",
                "MergedDir": "/var/lib/docker/overlay2/462cef4adf522157e3ca7b7a86af6341f141c21da54e30234c2a35264a01dae4/merged",
                "UpperDir": "/var/lib/docker/overlay2/462cef4adf522157e3ca7b7a86af6341f141c21da54e30234c2a35264a01dae4/diff",
                "WorkDir": "/var/lib/docker/overlay2/462cef4adf522157e3ca7b7a86af6341f141c21da54e30234c2a35264a01dae4/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:6cebf3abed5fac58d2e792ce8461454e92c245d5312c42118f02e231a73b317f",
                "sha256:f7eae43028b334123c3a1d778f7bdf9783bbe651c8b15371df0120fd13ec35c5",
                "sha256:7beb13bce073c21c9ee608acb13c7e851845245dc76ce81b418fdf580c45076b",
                "sha256:122be11ab4a29e554786b4a1ec4764dd55656b59d6228a0a3de78eaf5c1f226c"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]
Liaos-MBP:scg-control liaoisaac$ 
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Docker - start nginx with port mapping


  • Start container in background: run -d (for running in background) with port mapping
# Pull nginx 
isaac@isaac-KVM:~$ docker pull nginx:latest
latest: Pulling from library/nginx
fc7181108d40: Pull complete
c4277fc40ec2: Pull complete
780053e98559: Pull complete
Digest: sha256:bdbf36b7f1f77ffe7bd2a32e59235dff6ecf131e3b6b5b96061c652f30685f3a
Status: Downloaded newer image for nginx:latest
isaac@isaac-KVM:~$
isaac@isaac-KVM:~$ docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              719cd2e3ed04        4 days ago          109MB
ubuntu              latest              7698f282e524        4 weeks ago         69.9MB

# Start nginx, specify port mapping from 1234 to 80 in container
isaac@isaac-KVM:~$ docker container run -d --name webwww -p 0.0.0.0:1234:80 nginx
c1b65461eefde6a3e86509602982e2eeaf7616838efa369d5504b2c9c412f8db

# List container, confirmed port mapping
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
c1b65461eefd        nginx               "nginx -g 'daemon of…"   9 hours ago         Up 9 hours          0.0.0.0:1234->80/tcp   webwww

# Test 80 port is unreachable
isaac@isaac-KVM:~$ curl http://10.206.84.167:80
curl: (7) Failed to connect to 10.206.84.167 port 80: Connection refused

# Test 1234 port is available
isaac@isaac-KVM:~$ curl http://10.206.84.167:1234
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>


<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>


<p><em>Thank you for using nginx.</em></p>
</body>
</html>

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Docker - container - restart policy


Policies: 
  • always
  • unless-stopped
  • on-failure

Always
  1. Always restart
  2. Unless use command to stop it
  3. Restart when docker restart, even it has been stopped by command
Ex. docker container run -it {name} --restart always
Ex. After exit the shell, container will stop because the only one process was killed. But it will be restarted right away.
# Run container
Liaos-MBP:scg-control liaoisaac$ docker container run -it ubuntu /bin/bash

# There is only one process -> /bin/bash
root@1888da48ff01:/# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  1.3  0.1  18504  3352 pts/0    Ss   05:03   0:00 /bin/bash
root        11  0.0  0.1  34396  2912 pts/0    R+   05:03   0:00 ps aux
root@1888da48ff01:/# exit
exit

# Once exit, container will be stopped because there is only one process in container
Liaos-MBP:scg-control liaoisaac$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
Liaos-MBP:scg-control liaoisaac$

# Specify --restart always after “run"
Liaos-MBP:scg-control liaoisaac$ docker container run --restart always -it ubuntu /bin/bash
root@912e47da3142:/# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.5  0.1  18504  3444 pts/0    Ss   05:11   0:00 /bin/bash
root        10  0.0  0.1  34396  2808 pts/0    R+   05:12   0:00 ps aux
root@912e47da3142:/# exit
exit

# Once exit, container will be restarted right away
Liaos-MBP:scg-control liaoisaac$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
912e47da3142        ubuntu              "/bin/bash"         17 seconds ago      Up 2 seconds                            hungry_khorana
Liaos-MBP:scg-control liaoisaac$


Liaos-MBP:scg-control liaoisaac$ docker stop 912e47da3142
912e47da3142
Liaos-MBP:scg-control liaoisaac$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

# After restart docker in Mac, applications will be restarted
Liaos-MBP:scg-control liaoisaac$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
912e47da3142        ubuntu              "/bin/bash"         2 days ago          Up 13 seconds                           hungry_khoran

# After docker restart, container will be restarted again
# Following is ubuntu example
isaac@isaac-KVM:~$ service docker restart
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to restart 'docker.service'.
Authenticating as: isaac,,, (isaac)
Password:
==== AUTHENTICATION COMPLETE ===
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e4403fafa5bb        ubuntu              "/bin/bash"         3 minutes ago       Up 5 seconds                            optimistic_leh                                             mann




unless-stopped
  1. Always restart unless it is stopped by command
  2. Wont restart when daemon restart
  3. Ex. — restart unless-stopped
# Start bash with unless-stopped
isaac@isaac-KVM:~$ docker container run --restart unless-stopped -it ubuntu /bin/bash
root@3be8ac8498a7:/# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  4.8  0.0  18504  3536 pts/0    Ss   17:53   0:00 /bin/bash
root        10  0.0  0.0  34396  2936 pts/0    R+   17:53   0:00 ps aux
root@3be8ac8498a7:/# exit
exit

# Kill the only one process, container stopped and restart automatically because restart policy is unless-stopped
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
3be8ac8498a7        ubuntu              "/bin/bash"         19 seconds ago      Up 7 seconds                            nostalgic_gagarin

# Use command to stop a container
isaac@isaac-KVM:~$ docker container stop 3be8ac8498a7
3be8ac8498a7
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

# Container is not started after docker restart because restart policy is unless-stopped
isaac@isaac-KVM:~$ sudo service docker restart
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
isaac@isaac-KVM:~$



on-failure
  1. Restart container when it's stopped with non-zero exit code
  2. Restart container when docker restart
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Docker - container - start and stop container


  • Run a container
  • Ex. docker container run <image> <app>
  • Ex. docker container run -it ubuntu /bin/bash
  • -it will connect to current terminal
  • Stop container: docker container stop
  • Start container: docker container start
# Originally there are 8 containers
isaac@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                        PORTS               NAMES
71c2bac3e63f        ubuntu              "/bin/bash"              2 minutes ago       Exited (127) 30 seconds ago                       dreamy_neumann
5a6744d26f4d        ubuntu              "/bin/sh"                3 minutes ago       Exited (0) 2 minutes ago                          nostalgic_swanson
0f0ddaa9c4f4        nginx               "nginx -g 'daemon of…"   3 minutes ago       Exited (0) 3 minutes ago                          cranky_turing
5a8dfb31e1b5        nginx               "nginx -g 'daemon of…"   4 minutes ago       Exited (0) 4 minutes ago                          quirky_newton
20a69a2f40b0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           sharp_zhukovsky
28a62f8da2d0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           affectionate_curran
4df4b2d4c69e        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           gracious_jones
81977c50304b        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           cocky_poincare
isaac@isaac-KVM:~$

# Start new container
isaac@isaac-KVM:~$ docker container run -it ubuntu /bin/bash
root@1bbcd62b047b:/# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
root@1bbcd62b047b:/# exit
exit

# Now there are 9 containers
isaac@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                            PORTS               NAMES
1bbcd62b047b        ubuntu              "/bin/bash"              9 seconds ago       Exited (0) 4 seconds ago                              blissful_turing
71c2bac3e63f        ubuntu              "/bin/bash"              2 minutes ago       Exited (127) About a minute ago                       dreamy_neumann
5a6744d26f4d        ubuntu              "/bin/sh"                3 minutes ago       Exited (0) 3 minutes ago                              nostalgic_swanson
0f0ddaa9c4f4        nginx               "nginx -g 'daemon of…"   4 minutes ago       Exited (0) 4 minutes ago                              cranky_turing
5a8dfb31e1b5        nginx               "nginx -g 'daemon of…"   5 minutes ago       Exited (0) 5 minutes ago                              quirky_newton
20a69a2f40b0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                               sharp_zhukovsky
28a62f8da2d0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                               affectionate_curran
4df4b2d4c69e        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                               gracious_jones
81977c50304b        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                               cocky_poincare

# No container alive, because the latest process was killed by exit
isaac@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
isaac@isaac-KVM:~$

  • Del container: docker container rm
isaac@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                        PORTS               NAMES
1bbcd62b047b        ubuntu              "/bin/bash"              11 minutes ago      Exited (0) 11 minutes ago                         blissful_turing
71c2bac3e63f        ubuntu              "/bin/bash"              14 minutes ago      Exited (127) 12 minutes ago                       dreamy_neumann
5a6744d26f4d        ubuntu              "/bin/sh"                15 minutes ago      Exited (0) 15 minutes ago                         nostalgic_swanson
0f0ddaa9c4f4        nginx               "nginx -g 'daemon of…"   15 minutes ago      Exited (0) 15 minutes ago                         cranky_turing
5a8dfb31e1b5        nginx               "nginx -g 'daemon of…"   17 minutes ago      Exited (0) 16 minutes ago                         quirky_newton
20a69a2f40b0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           sharp_zhukovsky
28a62f8da2d0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           affectionate_curran
4df4b2d4c69e        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           gracious_jones
81977c50304b        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           cocky_poincare

isaac@isaac-KVM:~$ docker container rm 81977c50304b
81977c50304b


isaac@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                        PORTS               NAMES
1bbcd62b047b        ubuntu              "/bin/bash"              12 minutes ago      Exited (0) 11 minutes ago                         blissful_turing
71c2bac3e63f        ubuntu              "/bin/bash"              14 minutes ago      Exited (127) 13 minutes ago                       dreamy_neumann
5a6744d26f4d        ubuntu              "/bin/sh"                15 minutes ago      Exited (0) 15 minutes ago                         nostalgic_swanson
0f0ddaa9c4f4        nginx               "nginx -g 'daemon of…"   16 minutes ago      Exited (0) 15 minutes ago                         cranky_turing
5a8dfb31e1b5        nginx               "nginx -g 'daemon of…"   17 minutes ago      Exited (0) 17 minutes ago                         quirky_newton
20a69a2f40b0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           sharp_zhukovsky
28a62f8da2d0        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           affectionate_curran
4df4b2d4c69e        ubuntu:latest       "/bin/bash"              2 months ago        Exited (0) 2 months ago                           gracious_jones
isaac@isaac-KVM:~$
  • Kill the only one process in container also kill the container
  • Ctrl - PQ: exit container without terminating it
  • Ex. Reattach to container terminal docker container exec -it {containerid} bash 
  • After reattach terminal and execute ps command, will see 2 processes. Because docker container exec command create new one, means exit this time will not kill container
# There is no container
dockeruser@isaac-KVM:~$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

# After run, one bash process in container
dockeruser@isaac-KVM:~$ docker container run -it ubuntu /bin/bash
root@1653d3c07542:/# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  6.2  0.0  18504  3452 pts/0    Ss   17:33   0:00 /bin/bash
root        11  0.0  0.0  34396  2856 pts/0    R+   17:33   0:00 ps aux

# Ctrl + PQ to exit terminal
root@1653d3c07542:/# dockeruser@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
1653d3c07542        ubuntu              "/bin/bash"         28 seconds ago      Up 27 seconds                           flamboyant_ganguly

# Reattach container
dockeruser@isaac-KVM:~$ docker container exec -it 1653d3c07542 bash

# Find there are 2 processes
root@1653d3c07542:/# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.2  0.0  18504  3452 pts/0    Ss+  17:33   0:00 /bin/bash
root        12  5.5  0.0  18504  3428 pts/1    Ss   17:34   0:00 bash
root        21  0.0  0.0  34396  2868 pts/1    R+   17:34   0:00 ps aux

# So container will not terminate because there are more than one process
root@1653d3c07542:/# exit
exit
dockeruser@isaac-KVM:~$ docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
1653d3c07542        ubuntu              "/bin/bash"         2 minutes ago       Up 2 minutes                            flamboyant_ganguly
dockeruser@isaac-KVM:~$
  • Delete container
  • 1. docker container stop {name}
  • 2. docker container rm {name}
  • Or: docker container rm {name} -f

  • Ex. Check docker is running: docker version
isaac@isaac-KVM:~$ docker version
Client:
Version:           18.09.7
API version:       1.39
Go version:        go1.10.4
Git commit:        2d0083d
Built:             Wed Jul  3 12:13:54 2019
OS/Arch:           linux/amd64
Experimental:      false


Server:
Engine:
  Version:          18.09.7
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       2d0083d
  Built:            Mon Jul  1 19:14:14 2019
  OS/Arch:          linux/amd64
  Experimental:     false
  • Need make sure username is in docker user group
  • Add to usergroup if it is not: usermod -aG docker <user>
# add user
isaac@isaac-KVM:~$ sudo adduser dockeruser
[sudo] password for isaac:
Adding user `dockeruser' ...
Adding new group `dockeruser' (1001) ...
Adding new user `dockeruser' (1001) with group `dockeruser' ...
Creating home directory `/home/dockeruser' ...
Copying files from `/etc/skel' ...
New password:
Retype new password:
passwd: password updated successfully
Changing the user information for dockeruser
Enter the new value, or press ENTER for the default
        Full Name []:
        Room Number []:
        Work Phone []:
        Home Phone []:
        Other []:
Is the information correct? [Y/n]
isaac@isaac-KVM:~$

# change to dockeruser, but unable to execute docker version
isaac@isaac-KVM:~$ su - dockeruser
Password:
dockeruser@isaac-KVM:~$ docker version
Client:
Version:           18.09.7
API version:       1.39
Go version:        go1.10.4
Git commit:        2d0083d
Built:             Wed Jul  3 12:13:54 2019
OS/Arch:           linux/amd64
Experimental:      false
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.39/version: dial unix /var/run/docker.sock: connect: permission denied
dockeruser@isaac-KVM:~$

# it's because not in docker group, so need add to docker group (Notice this action need to be did by sudouser)
dockeruser@isaac-KVM:~$ usermod -aG docker dockeruser
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.
dockeruser@isaac-KVM:~$ sudo usermod -aG docker dockeruser
[sudo] password for dockeruser:
dockeruser is not in the sudoers file.  This incident will be reported.
dockeruser@isaac-KVM:~$ su - isaac
Password:
isaac@isaac-KVM:~$ usermod -aG docker dockeruser
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.
isaac@isaac-KVM:~$ sudo usermod -aG docker dockeruser

# after add to docker user group, dockeruser can use docker version
isaac@isaac-KVM:~$ su - dockeruser
Password:
dockeruser@isaac-KVM:~$ docker version
Client:
Version:           18.09.7
API version:       1.39
Go version:        go1.10.4
Git commit:        2d0083d
Built:             Wed Jul  3 12:13:54 2019
OS/Arch:           linux/amd64
Experimental:      false


Server:
Engine:
  Version:          18.09.7
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       2d0083d
  Built:            Mon Jul  1 19:14:14 2019
  OS/Arch:          linux/amd64
  Experimental:     false
dockeruser@isaac-KVM:~$




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