a developer

Microservice Patterns - Hexagonal architecture

Inbound adapters: handle requests from the outside by invoking the business logic
Outbound adapters: invoked by the business logic and invoke external applications
Port: defines a set of operations and is how the business logic interacts with what’s outside of it

inbound port: an API exposed by the business logic, which enables it to be invoked by external applications. Ex. service interface / service public method
outbound port: how the business logic invokes external systems. ex. repository interface, which defines a collection of data access operations

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:~$

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$

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>

Docker - container - restart policy

Policies:

always
unless-stopped
on-failure

Always

Always restart
Unless use command to stop it
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

Always restart unless it is stopped by command
Wont restart when daemon restart
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

Restart container when it's stopped with non-zero exit code
Restart container when docker restart

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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