docker container

docker

默认情况下，Docker 会为你提供一个隐含的 ENTRYPOINT，即：/bin/sh -c。所以，在不指定 ENTRYPOINT 时，比如运行在容器里的完整进程是：/bin/sh -c “python xxx.py”，即 CMD 的内容就是 ENTRYPOINT 的参数

user

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# Add the current user
sudo usermod -a -G docker $(whoami)

# Add a specific user
sudo usermod -a -G docker custom-user

容器

  • check

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    # 查看正在运行
    docker ps
    # 查看所有
    docker ps -a

  • docker run

    docker run is a higher-level command that combines multiple subcommands (docker create, docker start, docker exec, etc.) into a single step.

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    # 创建容器
    docker run -p <宿主机端口>:<容器端口> <镜像名称>[:标签]

    # 设置容器停止之后自动清理容器
    docker run --rm xxx  # --rm This flag tells Docker to automatically remove the container when it exits.

  • other

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    # 启动
    docker start 容器名或容器 id

    # 终止
    docker stop [NAME]/[CONTAINER ID]:将容器退出。
    docker kill [NAME]/[CONTAINER ID]:强制停止一个容器。

    # 清理已经停止的容器
    docker container prune

    # 查看容器端口
    docker port {container_id}

    # 查看容器启动命令
    docker inspect -f '{{.Config.Cmd}}' {container_id}

    # 查看容器挂载信息
    docker inspect {container_id} --format='{{json .Mounts}}' | jq


    # 删除
    docker rm -f 容器id
    # 导出
    docker export 容器id > xxx.tar
    # 导入
    docker import - test/xxx:v1
    # 重启
    docker restart $container_id
    # 日志
    docker logs $container_id

    # 复制文件 在容器运行和停止的状态均可执行
    docker cp <source-path> <container-name>:<destination-path>

volume

Propagation Modes

with rshared: Unmounting inside the container affects the host’s mount as well.

with rprivate: Unmounting inside the container only affects the container, leaving the host’s mounts untouched.

  • rprivate (Recursive Private):

    • Isolated Mount Propagation: When a mount point is set to rprivate, any mount or unmount events within that mount are not propagated between the container and the host or vice versa. Changes in mounts within the container are isolated.

      Example: If you mount or unmount a file system inside the container, it won’t affect the corresponding mount on the host. Similarly, changes to the mounts on the host won’t reflect inside the container.

  • rshared (Recursive Shared):

    • Mount Propagation Between Host and Container: In rshared mode, mount and unmount events are propagated both ways between the host and the container.

      Example: If you unmount or mount something inside the container, it will be reflected on the host. Conversely, if the host unmounts or mounts a file system on that mount point, it will also reflect inside the container.

network

Driver Description
bridge The default network driver.
host Remove network isolation between the container and the Docker host.
none Completely isolate a container from the host and other containers.
overlay Overlay networks connect multiple Docker daemons together.
ipvlan IPvlan networks provide full control over both IPv4 and IPv6 addressing.
macvlan Assign a MAC address to a container.

  • 列出docker的所有网络模式

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    docker network ls

  • 针对bridge和host分别查找有哪些container在其中

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    docker network inspect bridge
    docker network inspect host

  • 直接查看container的信息，找到network段查看。或者用grep筛选出network。

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    docker inspect 容器名/容器ID
    docker inspect 容器名/容器ID | grep -i “network” # 其中grep的“-i”表示不区分大小写。

Exit Codes

Common exit codes associated with docker containers are:

  • Exit Code 0: Absence of an attached foreground process

  • Exit Code 1: Indicates failure due to application error

  • Exit Code 137: Indicates failure as container received SIGKILL (Manual intervention or ‘oom-killer’ [OUT-OF-MEMORY])

  • Exit Code 139: Indicates failure as container received SIGSEGV

  • Exit Code 143: Indicates failure as container received SIGTERM

  • Exit Code 126: Permission problem or command is not executable

  • Exit Code 127: Possible typos in shell script with unrecognizable characters

mysql

  • 密码123456

  • 创建容器

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    docker run --name mysql-server -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7
    注意：
    -d:让容器在后台运行
    -P(大写):是容器内部端口随机映射到主机的高端口
    -p(小写):是容器内部端口绑定到指定的主机端口

  • 进入容器

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    docker exec -it mysql-server /bin/bash
    或
    docker exec -it mysql-server /bin/sh

  • 访问

    docker exec -it mysql-server mysql -uroot -p

  • 修改root 可以通过任何客户端连接

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    ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

  • 从外部访问docker mysql-server

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    mysql -h127.0.0.1 -P3306 -uroot -p

  • 导入sql文件

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    先将文件导入到容器
    #docker cp **.sql 容器名:/root/
    进入容器
    #docker exec -ti 容器名或ID sh
    登录数据库
    # mysql -uroot -p 
    将文件导入数据库
    source 数据库名 < /root/***.sql

  • 导出数据库

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    docker exec -it  mysql-server（容器名） mysqldump -uroot -p123456 数据库名称 > /opt/sql_bak/test_db.sql（导出表格路径）

portainer

  • 密码重置

    • 下载帮助镜像portainer/helper-reset-password

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      docker pull portainer/helper-reset-password

    • 停止运行的portainer

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      docker stop "id-portainer-container"

    • 运行重置命令

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      docker run --rm -v portainer_data:/data portainer/helper-reset-password

    • 结果

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      2020/06/04 00:13:58 Password successfully updated for user: admin
      2020/06/04 00:13:58 Use the following password to login: &_4#\3^5V8vLTd)E"NWiJBs26G*9HPl1

    • 重新运行portainer,密码 为👆重置的 &_4#\3^5V8vLTd)E”NWiJBs26G*9HPl1

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      docker start "id-portainer-container"

  • 现在密码为 admin/admin

  • 重新安装

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    sudo docker run -d -p 8000:8000 -p 9443:9443 --name portainer \
        --restart=always \
        -v /var/run/docker.sock:/var/run/docker.sock \
        -v portainer_data:/data \
        cr.portainer.io/portainer/portainer-ce:2.9.3

nacos

  • run
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    docker run -d --name nacos -p 8848:8848 -e PREFER_HOST_MODE=hostname -e MODE=standalone nacos/nacos-server
    • Linux memory is insufficient
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      docker run -e JVM_XMS=256m -e JVM_XMX=256m --env MODE=standalone --name nacos -d -p 8848:8848 nacos/nacos-server

redis

使用docker-compose up redis启动容器时，如果配置自定义配置文件 redis.conf，需要设置

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bind 0.0.0.0
daemonize no

docker-compose.yml文件内容

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version: "3.7"                                                                            services:
  redis:
    image: "redis:alpine"
    stdin_open: true #打开标准输入，可以接受外部输入。
    tty: true  #模拟一个伪终端。
    volumes:
      - /docker/projects/test/redis.conf:/data/redis.conf # 主机路径:容器路径
    #   - /docker/projects/test/redis/data:/data
    #   - /docker/projects/test/redis/logs:/logs
    command: redis-server --include /data/redis.conf

使用 docker-compose –verbose up redis启动，可查看启动详情

修改已有容器的端口映射

  1. 停止容器

  2. 停止docker服务(systemctl stop docker)

  3. 修改这个容器的hostconfig.json文件中的端口（原帖有人提到，如果config.v2.json里面也记录了端口，也要修改）

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    cd /var/lib/docker/3b6ef264a040* #这里是CONTAINER ID
    vi hostconfig.json
    如果之前没有端口映射, 应该有这样的一段:
    "PortBindings":{}
    增加一个映射, 这样写:
    "PortBindings":{"3306/tcp":[{"HostIp":"","HostPort":"3307"}]}
    前一个数字是容器端口, 后一个是宿主机端口. 
    而修改现有端口映射更简单, 把端口号改掉就行.

  4. 启动docker服务(systemctl start docker)

  5. 启动容器

配置容器的镜像源（安装vim）

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mv /etc/apt/sources.list /etc/apt/sources.list.bak

echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib" >/etc/apt/sources.list

echo "deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list

echo "deb-src http://mirrors.163.com/debian/ jessie main non-free contrib" >>/etc/apt/sources.list

echo "deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list 
#更新安装源 
apt-get update 
#如果下载过程中卡在[waiting for headers] 删除/var/cache/apt/archives/下的所有文件 
#安装vim 
apt-get install vim

dockerfile

  • RUN is executed while the image is being build

    while ENTRYPOINT is executed after the image has been built.

advanced

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echo "/core/core.%e.%p.%t" | sudo tee /proc/sys/kernel/core_pattern