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Docker基础

Docker基础一(基本配置)

 

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1、配置docker0 ip地址；

root@Userver01:~# cat /etc/docker/daemon.json

{

"bip": "172.16.10.1/24"

}

root@Userver01:~# systemctl restart docker.service

root@Userver01:~# ip add l

1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: ens32: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:cd:a0:83 brd ff:ff:ff:ff:ff:ff

    inet 172.16.251.131/24 brd 172.16.251.255 scope global ens32

       valid_lft forever preferred_lft forever

    inet6 fe80::20c:29ff:fecd:a083/64 scope link

       valid_lft forever preferred_lft forever

3: docker0: mtu 1500 qdisc noqueue state DOWN group default

    link/ether 02:42:80:e8:b3:52 brd ff:ff:ff:ff:ff:ff

    inet 172.16.10.1/24 brd 172.16.10.255 scope global docker0

       valid_lft forever preferred_lft forever

 

2、配置docker加速器；

root@Userver01:~# cat /etc/docker/daemon.json

{

"bip": "172.16.10.1/24",

"registry-mirrors": ["http://5dd4061a.m.daocloud.io"]

}

root@Userver01:~# systemctl restart docker.service

root@Userver01:~# docker info

Containers: 0

 Running: 0

 Paused: 0

 Stopped: 0

Images: 0

Server Version: 18.09.0

Storage Driver: overlay2

 Backing Filesystem: extfs

 Supports d_type: true

 Native Overlay Diff: true

Logging Driver: json-file

Cgroup Driver: cgroupfs

Plugins:

 Volume: local

 Network: bridge host macvlan null overlay

 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog

Swarm: inactive

Runtimes: runc

Default Runtime: runc

Init Binary: docker-init

containerd version: c4446665cb9c30056f4998ed953e6d4ff22c7c39

runc version: 4fc53a81fb7c994640722ac585fa9ca548971871

init version: fec3683

Security Options:

 apparmor

 seccomp

  Profile: default

Kernel Version: 4.4.0-131-generic

Operating System: Ubuntu 16.04.5 LTS

OSType: linux

Architecture: x86_64

CPUs: 8

Total Memory: 15.65GiB

Name: Userver01

ID: NB22:HKEI:YEOY:A2F4:TXZP:GEQO:OUME:CT4M:ENYA:VWIM:XXHG:KVK5

Docker Root Dir: /var/lib/docker

Debug Mode (client): false

Debug Mode (server): false

Registry: https://index.docker.io/v1/

Labels:

Experimental: false

Insecure Registries:

 127.0.0.0/8

Registry Mirrors:

 http://5dd4061a.m.daocloud.io/

Live Restore Enabled: false

Product License: Community Engine

 

WARNING: No swap limit support

 

3、配置docker服务日志格式；

root@Userver01:~# cat /etc/docker/daemon.json

{

"bip": "172.16.10.1/24",

"registry-mirrors": ["http://5dd4061a.m.daocloud.io"],

"log-driver": "journald"

}

root@Userver01:~# systemctl restart docker.service

root@Userver01:~# journalctl -xe _SYSTEMD_UNIT=docker.service

Nov 26 16:40:20 Userver01 dockerd[1979]: time="2018-11-26T16:40:20.462003344+08:00" level=info msg="Loading containers: start."

Nov 26 16:40:20 Userver01 dockerd[1979]: time="2018-11-26T16:40:20.630612895+08:00" level=info msg="Loading containers: done."

Nov 26 16:40:20 Userver01 dockerd[1979]: time="2018-11-26T16:40:20.678251298+08:00" level=info msg="Docker daemon" commit=4d60db4 graphdriver(s)=o

Nov 26 16:40:20 Userver01 dockerd[1979]: time="2018-11-26T16:40:20.678752739+08:00" level=info msg="Daemon has completed initialization"

 

4、配置docker DNS；

root@Userver01:~# cat /etc/docker/daemon.json

{

"bip": "172.16.10.1/24",

"registry-mirrors": ["http://5dd4061a.m.daocloud.io"],

"log-driver": "journald",

"dns": ["223.5.5.5","223.6.6.6"]

}

root@Userver01:~# systemctl restart docker.service

 

5、运行容器；

root@Userver01:~# docker run -d nginx:1.15

Unable to find image 'nginx:1.15' locally

1.15: Pulling from library/nginx

a5a6f2f73cd8: Pull complete

67da5fbcb7a0: Pull complete

e82455fa5628: Pull complete

Digest: sha256:372965e4f3a1d60ec5be171f839dfe9f8ea076700144f042bae87700a20c9ded

Status: Downloaded newer image for nginx:1.15

246b049b64e32ef924e30a0d614537061cf12a8d1a0408f469dbcf1030c0d554

root@Userver01:~# docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES

246b049b64e3        nginx:1.15          "nginx -g 'daemon of…"   22 seconds ago      Up 21 seconds       80/tcp              xenodochial_swirles

 

6、登录容器系统；

root@Userver01:~# docker exec -it 246 /bin/bash

root@246b049b64e3:/# cat /etc/resolv.conf

search localdomain

nameserver 223.5.5.5

nameserver 223.6.6.6


 

Docker基础二（容器管理）

1、运行容器

#启动一个httpd容器，使其在后台运行并将其80端口映射到宿主机80端口

root@Userver01:~# docker run -d -p 80:80 httpd

Unable to find image 'httpd:latest' locally

latest: Pulling from library/httpd

a5a6f2f73cd8: Already exists

ac13924397e3: Pull complete

91b81769f14a: Pull complete

fec7170426de: Pull complete

992c7790d5f3: Pull complete

Digest: sha256:63dba1dad8fe8a920226a631f8189d736b4a5129c2d2edc046a46f36ffc0091c

Status: Downloaded newer image for httpd:latest

b911f2812e516b140f69f412923264670074ec83e4b7aef186041f0e40d57cd4

root@Userver01:~# docker ps -a

CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS                NAMES

b911f2812e51        httpd               "httpd-foreground"   42 seconds ago      Up 41 seconds       0.0.0.0:80->80/tcp   modest_vaughan

 

#启动一个ubuntu 16.04的容器，打印完"hello world"即退出

root@Userver01:~# docker run ubuntu:16.04 /bin/echo "hello world."

Unable to find image 'ubuntu:16.04' locally

16.04: Pulling from library/ubuntu

7b8b6451c85f: Pull complete

ab4d1096d9ba: Pull complete

e6797d1788ac: Pull complete

e25c5c290bde: Pull complete

Digest: sha256:e547ecaba7d078800c358082088e6cc710c3affd1b975601792ec701c80cdd39

Status: Downloaded newer image for ubuntu:16.04

hello world.

root@Userver01:~# docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS                NAMES

4683e7b221b7        ubuntu:16.04        "/bin/echo 'hello wo…"   28 seconds ago      Exited (0) 27 seconds ago                        pedantic_swirles

b911f2812e51        httpd               "httpd-foreground"       3 minutes ago       Up 3 minutes                0.0.0.0:80->80/tcp   modest_vaughan

 

2、容器的启动过程说明：

•检查本地是否存在指定的镜像，如果没有就从指定的仓库下载

•利用镜像启动一个容器

•分配一个文件系统，并在只读的镜像层外面挂载一层可读写层

•从宿主机配置的网桥接口中桥接一个虚拟接口到容器中去

•从地址池配置一个IP给容器

•执行用户指定的程序

•执行完毕后停止容器

 

3、docker run常用选项说明

-t：配置一个伪终端并绑定到容器的标准输入上

-i：让容器的标准输入保持打开

-d：将容器放入后台运行

-c：指定分配该容器的cpu分片

-m：指定分配给该容器的内存大小，单位为B,K,M,G

 

4、查看当前节点上的容器状态

docker ps    #查看当前正在运行的容器

选项：

    -a：查看所有容器，包括停止的

    -q：只显示容器ID

-l：显示最后一次创建的容器

root@Userver01:~# docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS                NAMES

a5a204b817cc        ubuntu:16.04        "/bin/bash"              9 minutes ago       Exited (0) 9 minutes ago                         gifted_tereshkova

4683e7b221b7        ubuntu:16.04        "/bin/echo 'hello wo…"   18 minutes ago      Exited (0) 18 minutes ago                        pedantic_swirles

b911f2812e51        httpd               "httpd-foreground"       21 minutes ago      Up 21 minutes               0.0.0.0:80->80/tcp   modest_vaughan

root@Userver01:~# docker ps -q

b911f2812e51

root@Userver01:~# docker ps -qa

a5a204b817cc

4683e7b221b7

b911f2812e51

root@Userver01:~# docker ps -ql

a5a204b817cc

 

5、进入容器

docker exec-it <容器id/容器name> /bin/bash

root@Userver01:~# docker ps -qa

a5a204b817cc

4683e7b221b7

b911f2812e51

root@Userver01:~# docker exec -it b9 /bin/bash

root@b911f2812e51:/usr/local/apache2#

 

6、容器按用途大致可分为两类：

•服务类容器，如webserver、database等

•工具类容器，如curl容器、redis-cli容器等

 

7、容器的启停操作

#容器的创建：

    docker create

#容器的启动：

    docker start <容器id>

#容器的停止：

    docker stop <容器id>

    docker kill <容器id>

#容器的重启：

    docker restart <容器id>

#容器的删除：

    docker rm <容器id>

   选项：

        -f：强行终止并删除一个运行中的容器

        -v：删除容器挂载的数据卷

#暂停容器：

    docker pause <容器id>

#从暂停中恢复：

docker unpause <容器id>

 

8、容器生命周期管理

Docker 基础

 

9、容器资源限制

内存限制

-m：允许分配的内存大小

--memory-swap：允许分配的内存和swap的总大小

--memory-swapiness：控制内存与swap置换的比例

 

启动一个ubuntu容器，限制内存为200M,内存与swap的总和为300M:

docker run -it -m 200M --memory-swap 300M ubuntu:16.04

 

CPU限制

docker可以通过-c或--cpu-shares设置容器使用的cpu的权重。如果不指定，默认为1024

 

docker run --name container_A -c 1024 ubuntu

docker run --name container_B -c 512 ubuntu

container_A的cpu share 1024，是 container_B的两倍。当两个容器都需要 CPU资源时，container_A可以得到的 CPU是container_B的两倍。

 

io限制

•--device-read-bps，限制读某个设备的 bps。

•--device-write-bps，限制写某个设备的 bps。

•--device-read-iops，限制读某个设备的 iops。

•--device-write-iops，限制写某个设备的 iops。

 

#创建一个容器，限制写的bps为30M

docker run -it --device-write-bps /dev/sda:30MB ubuntu

 

Docker基础二（镜像管理）

1、镜像命名

一个完整的镜像命名：

[Docker Registry地址/][项目目录/]<名称>:[标签]

示例：

MySQL:5.6

ubuntu

hub.docker.com/library/centos:6.6

 

2、获取镜像

root@Userver01:~# docker pull ubuntu:16.04

16.04: Pulling from library/ubuntu

7b8b6451c85f: Already exists

ab4d1096d9ba: Already exists

e6797d1788ac: Already exists

e25c5c290bde: Already exists

Digest: sha256:e547ecaba7d078800c358082088e6cc710c3affd1b975601792ec701c80cdd39

Status: Downloaded newer image for ubuntu:16.04

 

3、查看镜像信息

root@Userver01:~# docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

ubuntu              16.04               a51debf7e1eb        7 days ago          116MB

nginx               1.15                e81eb098537d        10 days ago         109MB

httpd               latest              2a51bb06dc8b        11 days ago         132MB

centos              6.6                 4e1ad2ce7f78        6 weeks ago         203MB

root@Userver01:~# docker inspect a51

[

    {

        "Id": "sha256:a51debf7e1eb2018400cef1e4b01f2e9f591f6c739de7b5d6c142f954f3715a7",

        "RepoTags": [

            "ubuntu:16.04"

        ],

        "RepoDigests": [

            "ubuntu@sha256:e547ecaba7d078800c358082088e6cc710c3affd1b975601792ec701c80cdd39"

        ],

        "Parent": "",

        "Comment": "",

        "Created": "2018-11-19T21:23:53.455319926Z",

        "Container": "f4879d05f303ba132b6cc82988306e44819b9d0872dc891d864374d3a9b51b08",

        "ContainerConfig": {

            "Hostname": "f4879d05f303",

            "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:d6ab6854552cda39995558786e1690e20092af93f8145294473ac62fd76c9b1b",

            "Volumes": null,

            "WorkingDir": "",

            "Entrypoint": null,

            "OnBuild": null,

            "Labels": {}

        },

        "DockerVersion": "17.06.2-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:d6ab6854552cda39995558786e1690e20092af93f8145294473ac62fd76c9b1b",

            "Volumes": null,

            "WorkingDir": "",

            "Entrypoint": null,

            "OnBuild": null,

            "Labels": null

        },

        "Architecture": "amd64",

        "Os": "linux",

        "Size": 116379573,

        "VirtualSize": 116379573,

        "GraphDriver": {

            "Data": {

                "LowerDir": "/var/lib/docker/overlay2/d24cfbca95c7fb4a2653aed1fef5e854164d5e452ec1ca1f08d256a841ec9cbe/diff:/var/lib/docker/overlay2/1bc9dd6a582662525ae316dca49703acbcc8087c0549354c622cd0c4eb7095de/diff:/var/lib/docker/overlay2/402ffcd593a76628eb8f3b6dd843b195396729227e55c51c896089ca668770ef/diff",

                "MergedDir": "/var/lib/docker/overlay2/6f5f819b34a36a3cd93e84d2a12a86a3e61f5663a7401ae73cd308211cc3329f/merged",

                "UpperDir": "/var/lib/docker/overlay2/6f5f819b34a36a3cd93e84d2a12a86a3e61f5663a7401ae73cd308211cc3329f/diff",

                "WorkDir": "/var/lib/docker/overlay2/6f5f819b34a36a3cd93e84d2a12a86a3e61f5663a7401ae73cd308211cc3329f/work"

            },

            "Name": "overlay2"

        },

        "RootFS": {

            "Type": "layers",

            "Layers": [

                "sha256:41c002c8a6fd36397892dc6dc36813aaa1be3298be4de93e4fe1f40b9c358d99",

                "sha256:647265b9d8bc572a858ab25a300c07c0567c9124390fd91935430bf947ee5c2a",

                "sha256:819a824caf709f224c414a56a2fa0240ea15797ee180e73abe4ad63d3806cae5",

                "sha256:3db5746c911ad8c3398a6b72aa30580b25b6edb130a148beed4d405d9c345a29"

            ]

        },

        "Metadata": {

            "LastTagTime": "0001-01-01T00:00:00Z"

        }

    }

]

 

4、为镜像创建tag

root@Userver01:~# docker tag ubuntu:16.04 dl.dockerpool.com/library/ubuntu:16.04v1

root@Userver01:~# docker image ls

REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE

dl.dockerpool.com/library/ubuntu   16.04v1             a51debf7e1eb        7 days ago          116MB

ubuntu                             16.04               a51debf7e1eb        7 days ago          116MB

nginx                              1.15                e81eb098537d        10 days ago         109MB

httpd                              latest              2a51bb06dc8b        11 days ago         132MB

centos                             6.6                 4e1ad2ce7f78        6 weeks ago         203MB

 

5、搜索镜像

root@Userver01:~# docker search mysql

NAME                                                   DESCRIPTION                                     STARS               OFFICIAL            AUTOMATED

mysql                                                  MySQL is a widely used, open-source relation…   7407                [OK]               

mariadb                                                MariaDB is a community-developed fork of MyS…   2376                [OK]               

mysql/mysql-server                                     Optimized MySQL Server Docker images. Create…   552                                     [OK]

zabbix/zabbix-server-mysql                             Zabbix Server with MySQL database support       145                                     [OK]

hypriot/rpi-mysql                                      RPi-compatible Docker Image with Mysql          102                                    

zabbix/zabbix-web-nginx-mysql                          Zabbix frontend based on Nginx web-server wi…   77                                      [OK]

centurylink/mysql                                      Image containing mysql. Optimized to be link…   59                                      [OK]

1and1internet/ubuntu-16-nginx-php-phpmyadmin-mysql-5   ubuntu-16-nginx-php-phpmyadmin-mysql-5          47                                      [OK]

 

6、删除镜像（注：如果镜像有容器生成，需要先删除容器）

#如果一个镜像有多个tag，只会删除指定的tag，镜像本身不会删除，如果docker rmi后指定镜像ID，则所有tag都会被删除

root@Userver01:~# docker rmi dl.dockerpool.com/library/ubuntu:16.04v1

Untagged: dl.dockerpool.com/library/ubuntu:16.04v1

root@Userver01:~# docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

ubuntu              16.04               a51debf7e1eb        7 days ago          116MB

nginx               1.15                e81eb098537d        10 days ago         109MB

httpd               latest              2a51bb06dc8b        11 days ago         132MB

centos              6.6                 4e1ad2ce7f78        6 weeks ago         203MB

root@Userver01:~# docker rmi ubuntu:16.04

Error response from daemon: conflict: unable to remove repository reference "ubuntu:16.04" (must force) - container 4683e7b221b7is using its referenced image a51debf7e1eb

root@Userver01:~# docker rmi ubuntu:16.04 -f

Untagged: ubuntu:16.04

Untagged: ubuntu@sha256:e547ecaba7d078800c358082088e6cc710c3affd1b975601792ec701c80cdd39

Deleted: sha256:a51debf7e1eb2018400cef1e4b01f2e9f591f6c739de7b5d6c142f954f3715a7

root@Userver01:~# docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                         PORTS                NAMES

a5a204b817cc        a51debf7e1eb        "/bin/bash"              About an hour ago   Exited (0) About an hour ago                        gifted_tereshkova

4683e7b221b7       a51debf7e1eb        "/bin/echo 'hello wo…"   About an hour ago   Exited (0) About an hour ago                        pedantic_swirles

b911f2812e51        httpd               "httpd-foreground"       About an hour ago   Up About an hour               0.0.0.0:80->80/tcp   modest_vaughan

root@Userver01:~# docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

nginx               1.15                e81eb098537d        10 days ago         109MB

httpd               latest              2a51bb06dc8b        11 days ago         132MB

centos              6.6                 4e1ad2ce7f78        6 weeks ago         203MB

 

#删除无标签镜像（即为none）

root@Userver01:~# docker rmi $(docker images -q --filter "dangling=true")

 

7、导出和载入镜像

root@Userver01:~# docker save -o ubuntu_16.04.tar ubuntu:16.04

root@Userver01:~# docker rmi ubuntu:16.04 -f

Untagged: ubuntu:16.04

Deleted: sha256:a51debf7e1eb2018400cef1e4b01f2e9f591f6c739de7b5d6c142f954f3715a7

root@Userver01:~# docker load --input ubuntu_16.04.tar

Loaded image: ubuntu:16.04

 

8、通过docker commit提交一个新镜像

docker commit -m "change httpd.conf file" -a "john" b911f2812e51 test  #使用b911f2812e51容器生成一个名为test的镜像

-a：指定作者

-m：相关说明信息

-p：提交时暂停容器运行


文章题目：Docker基础
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