Study Group: 內湖成五品質保證 docker-讀書會-01

June 27, 2020 8 minute read

Tags: docker, 讀書會

Udemy

Section 3: 18

command
- docker version
  - verified cli can tlak to engine
- docker info
  - show most configuration values for the engine
- docker
  - Management Commands:
    - 太多 commands 了 lol… 所以用更多 commands 來管控其他 commands XDDDD
  - Commands
- docker command line structure
  - old (still works): docker <command> (options)
  - new: docker <command> <sub-command> (opitons)
  - ex:
    docker run docker contianer run

Section 3: 19

用 nginx 當範例
- docker container run --publish 80:80 nginx
  - 1. Downloaded image 'nginx' from Docker Hub
  - 2. Started a new container from that image
  - 3. Opened port 80 on the host IP
  - 4. Routes that traffic to the container IP, port 80
- detach:
  - run container in background
  - ex: docker container run -d -publish 80:80 nginx
- docker container ls:
  - list running containers
  - ex: docker container ls
    - old way: docker ps
  - list all containers
  - ex: docker contianer ls -a
- docker container stop
  - stops the container process but doesn’t remove it
  - ex: docker continaer sotp <container-id/container-name>
- run vs. start
  - _docker container run always starts a new container
  - use docker container start to start an existing stopped one
- docker contaienr name:
  - ex: docker container run --publish 80:80 --detach --name webhost nginx
- docker container logs:
  - show logs for a specific container
  - ex: docker container logs <container-id/container-name>
    - old way: docker logs
- docker container rm:
  - remove(delete) one or more containers
    - ex: docker container rm <container-id/contianer-name>
      - old way: docker rm
  - 一次刪光光
    - docker container rm -f $(docker container ls -a -q)

自己教自己!!!

help!!!!!

ex: docker contianer

PS C:\Users\tim23> docker container
Usage:  docker container COMMAND
Manage containers
Commands:
  attach      Attach local standard input, output, and error streams to a running container
  commit      Create a new image from a container's changes
  cp          Copy files/folders between a container and the local filesystem
  create      Create a new container
  diff        Inspect changes to files or directories on a container's filesystem
  exec        Run a command in a running container
  export      Export a container's filesystem as a tar archive
  inspect     Display detailed information on one or more containers
  kill        Kill one or more running containers
  logs        Fetch the logs of a container
  ls          List containers
  pause       Pause all processes within one or more containers
  port        List port mappings or a specific mapping for the container
  prune       Remove all stopped containers
  rename      Rename a container
  restart     Restart one or more containers
  rm          Remove one or more containers
  run         Run a command in a new container
  start       Start one or more stopped containers
  stats       Display a live stream of container(s) resource usage statistics
  stop        Stop one or more running containers
  top         Display the running processes of a container
  unpause     Unpause all processes within one or more containers
  update      Update configuration of one or more containers
  wait        Block until one or more containers stop, then print their exit codes

ex: docker container top --help

 PS C:\Users\tim23> docker container top help
 Error response from daemon: No such container: help
 PS C:\Users\tim23> docker container top --help
         
 Usage:  docker container top CONTAINER [ps OPTIONS]
         
 Display the running processes of a container
 PS C:\Users\tim23> docker container top webhost
 PID                 USER                TIME                COMMAND
 4452                root                0:00                nginx: master process nginx -g daemon off;
 4484                101                 0:00                nginx: worker process

Section 3 : 20

Section 3 : 23 作業: Manage Multiple Containers

docs.docker.com and --help are your friend
Run a nginx, a mysql, and a httpd (apache) server
Run all of them --detach (or -d), name them with --name
nginx should listen on 80:80, httpd on 8080:80, mysql on 3306:3306
When running mysql, use the --env option (or -e) to pas in MYSQL_RANDOM_ROOT_PASSWORD=yes
Use docker container logs on mysql to find the random password it created on startup
Clean it all up with docker container sotp and docker container rm
Use docker container ls to ensure everything is correccrt before and after cleanup

( Section 3 : 24解答)

section 3: 25, 26

Whatis Going On In Containers
- docker container top : process list in one container
- docker container inspect : details of one container config
- docker container stats : performance stats for all containers
Getting a Shell Inside Containers: section3-26
- docker container run -it : start new container interactively
  - ` -t, –tty Allocate a pseudo-TTY`
  - -i, --interactive Keep STDIN open even if not attached
- docker container exec -it : run addtional command in existing container

EX: docker container run -it

usage: docker container run [OPTIONS] IMAGE [COMMAND] [ARG…]
bash shell
- if run with -it, it will give you a terminal inside the running container

 PS E:\> docker container run -it --name proxy nginx bash
 root@b9ba9ed265c2:/#
 root@b9ba9ed265c2:/# ls
 bin   dev  home  lib64       media  opt   root  sbin  sys  usr
 boot  etc  lib   lost+found  mnt    proc  run   srv   tmp  var
 root@b9ba9ed265c2:/# ls -a
 .   bin   dev  home  lib64       media  opt   root  sbin  sys  usr
 ..  boot  etc  lib   lost+found  mnt    proc  run   srv   tmp  var
 root@b9ba9ed265c2:/# ls -al
 total 72
 drwxr-xr-x  1 root root 4096 Dec 17 03:30 .
 drwxr-xr-x  1 root root 4096 Dec 17 03:30 ..
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 bin
 drwxr-xr-x  2 root root 4096 Nov 10 12:17 boot
 drwxr-xr-x  5 root root  360 Dec 17 03:30 dev
 drwxr-xr-x  1 root root   60 Dec 17 03:30 etc
 drwxr-xr-x  2 root root 4096 Nov 10 12:17 home
 drwxr-xr-x  1 root root 4096 Nov 23 01:12 lib
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 lib64
 drwx------  1 root root 4096 Jan  1  1970 lost+found
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 media
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 mnt
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 opt
 dr-xr-xr-x 83 root root    0 Dec 17 03:30 proc
 drwx------  2 root root 4096 Nov 18 00:00 root
 drwxr-xr-x  3 root root 4096 Nov 18 00:00 run
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 sbin
 drwxr-xr-x  2 root root 4096 Nov 18 00:00 srv
 dr-xr-xr-x 13 root root    0 Dec 17 03:30 sys
 drwxrwxrwt  1 root root 4096 Nov 23 01:12 tmp
 drwxr-xr-x  1 root root 4096 Nov 18 00:00 usr
 drwxr-xr-x  1 root root 4096 Nov 18 00:00 var
 root@b9ba9ed265c2:/# exit
 exit
 PS E:\> docker container ls
 CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                 NAMES
 99556f037386        mysql               "docker-entrypoint.s…"   20 minutes ago      Up 20 minutes       3306/tcp, 33060/tcp   yuting_mysql
 3c27ce765712        nginx               "nginx -g 'daemon of…"   21 minutes ago      Up 21 minutes       80/tcp                yuting_nginx
 PS E:\> docker container ls -al
 CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
 b9ba9ed265c2        nginx               "bash"              5 minutes ago       Exited (0) 17 seconds ago                       proxy
 PS E:\> docker container ls -a
 CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS                 NAMES
 b9ba9ed265c2        nginx               "bash"                   5 minutes ago       Exited (0) 21 seconds ago                         proxy
 99556f037386        mysql               "docker-entrypoint.s…"   21 minutes ago      Up 21 minutes               3306/tcp, 33060/tcp   yuting_mysql
 3c27ce765712        nginx               "nginx -g 'daemon of…"   22 minutes ago      Up 22 minutes               80/tcp                yuting_nginx
 P

EX: docker container run -it --name ubuntu ubuntu

ubuntu run defalut 就是 bash
root@91260785437d:/# apt-get update
root@91260785437d:/# apt-get install -y curl
curl google.com

 PS E:\> docker container run -it --name ubuntu ubuntu
 Unable to find image 'ubuntu:latest' locally
 latest: Pulling from library/ubuntu
 7ddbc47eeb70: Pull complete 
 c1bbdc448b72: Pull complete 
 8c3b70e39044: Pull complete
 45d437916d57: Pull complete
 Digest: sha256:6e9f67fa63b0323e9a1e587fd71c561ba48a034504fb804fd26fd8800039835d
 Status: Downloaded newer image for ubuntu:latest
 root@91260785437d:/# apt-get update
 ....
 Get:17 http://archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [2496 B]
 Get:18 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [4244 B]
 Fetched 17.4 MB in 28s (620 kB/s)
 Reading package lists... Done
   
 root@91260785437d:/# apt-get install -y curl
 Reading package lists... Done
 Building dependency tree
 ...
   
 root@91260785437d:/# curl google.com
 <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
 <TITLE>301 Moved</TITLE></HEAD><BODY>
 <H1>301 Moved</H1>
 The document has moved
 <A HREF="http://www.google.com/">here</A>.
 </BODY></HTML>

重新連上之前建好的 container

docker container start -ai

 PS E:\> docker container start --help
   
 Usage:  docker container start [OPTIONS] CONTAINER [CONTAINER...]
      
 Start one or more stopped containers
      
 Options:
   -a, --attach               Attach STDOUT/STDERR and forward signals
       --detach-keys string   Override the key sequence for detaching a
                              container
   -i, --interactive          Attach container's STDIN

  PS E:\> docker container ls -a
  CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS                 NAMES
  91260785437d        ubuntu              "/bin/bash"              13 minutes ago      Exited (0) 3 minutes ago                          ubuntu
  b9ba9ed265c2        nginx               "bash"                   22 minutes ago      Exited (0) 17 minutes ago                         proxy
  99556f037386        mysql               "docker-entrypoint.s…"   37 minutes ago      Up 37 minutes               3306/tcp, 33060/tcp   yuting_mysql
  3c27ce765712        nginx               "nginx -g 'daemon of…"   38 minutes ago      Up 38 minutes               80/tcp                yuting_nginx
  PS E:\> docker container start -ai ubuntu
  root@91260785437d:/# curl google.com
  <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
  <TITLE>301 Moved</TITLE></HEAD><BODY>
  <H1>301 Moved</H1>
  The document has moved
  <A HREF="http://www.google.com/">here</A>.
  </BODY></HTML>
  root@91260785437d:/#

Docker container exec

Run additional process in running container
docker container exec -it yuting_mysql bash

PS E:\> docker container exec -it yuting_mysql bash
root@99556f037386:/# ps aux
bash: ps: command not found
root@99556f037386:/# exit
exit
PS E:\> docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                 NAMES
99556f037386        mysql               "docker-entrypoint.s…"   44 minutes ago      Up 44 minutes       3306/tcp, 33060/tcp   yuting_mysql
3c27ce765712        nginx               "nginx -g 'daemon of…"   45 minutes ago      Up 45 minutes       80/tcp                yuting_nginx

Alpine Linux

A small security-focused distrubution
docker pull alpine
alpie : 沒有 defalut bash
- 用 sh
- PS E:\> docker container run -it alpine sh

 PS E:\> docker pull alpine
 Using default tag: latest
 latest: Pulling from library/alpine
 89d9c30c1d48: Pull complete                                                                             
 Digest: sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a
 Status: Downloaded newer image for alpine:latest
 docker.io/library/alpine:latest
 PS E:\> docker image ls
 REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
 httpd               latest              2ae34abc2ed0        2 weeks ago         184MB
 mysql               latest              d435eee2caa5        3 weeks ago         475MB
 nginx               latest              231d40e811cd        3 weeks ago         140MB
 ubuntu              latest              775349758637        6 weeks ago         73.9MB
 alpine              latest              965ea09ff2eb        8 weeks ago         6.3MB
 PS E:\> docker container run -it alpine sh
 / # exit
 PS E:\>

Package Management Basics: apt, yum, dnf, pkg
- https://www.digitalocean.com/community/tutorials/package-management-basics-apt-yum-dnf-pkg

Section 3 : 27, 28, 29

Docker Networks

Section 3 : 30

Docker Networks (DNS)

有畢卡葛~~~~

Section 3 : 31, 32 作業: CLI App Testing

Section 3 : 33, 34 作業: DNS Round Robin Test

好康相報

Windows 轉成 linux container (我很常會這樣) 開 docker 的時候都會出現
- ANS:
  - 下載 RAMMap
自己快樂練習

FROM alpine:3.6
LABEL writer="yuting"
RUN apk add --no-cache apache2 && \
    mkdir -p /run/apache2 && \
    echo "<html><h1>Yuting Have a Dream! YA~~~~</h1></html>" > \
    /var/www/localhost/htdocs/index.html
EXPOSE 80
ENTRYPOINT ["/usr/sbin/httpd", "-D", "FOREGROUND"]

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