docker compose

使用 docker compose 编排容器：把 n 个容器作为一个整体进行管理

1. 安装 docker compose

    1. 下载 docker compose

 curl -L https://get.daocloud.io/docker/compose/releases/download/1.24.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

    2. 给与可执行权限

 chmod +x /usr/local/bin/docker-compose

    3. 验证是否安装成功

 docker-compose --version

2. 准备目录和文件

    1. 创建/root/docker/spring-cloud-01-docker-compose 目录并进入

mkdir -p /root/docker/spring-cloud-01-docker-compose
cd /root/docker/spring-cloud-01-docker-compose

    2. 创建 mysql/conf.d mysql/data mysql/initdb.d 目录

mkdir -p mysql/conf.d mysql/data mysql/initdb.d

    3. 在 conf.d 下边添加 my.conf 文件

cd conf.d
touch my.conf
vi my.conf

    文件内容如下，设置MySQL为utf-8

[client]


default-character-set=utf8mb4




[mysqld]


character-set-client-handshake = FALSE


character-set-server = utf8mb4


collation-server = utf8mb4_unicode_ci






[mysql]


default-character-set=utf8mb4

    4. 在 initdb.d 下边添加 spring-cloud-01.sql 文件

3. 编写配置文件

    1. 回到 spring-cloud-01-docker-compose 目录
    
    2. 创建 docker-compose.yml 文件，并编辑
        key 的冒号后边必须有空格
        使用 两个 空格进行缩进

#指定我们要使用的compose版本
version:  '3'

services:
  mysql:
    image:  'docker-registry:5000/mysql:5.7.26'
    container_name:  mysql
    ports:
      - 3306:3306
    volumes:
      - /root/docker/spring-cloud-01-docker-compose/mysql/conf.d:/etc/mysql/conf.d/my.conf
      - /root/docker/spring-cloud-01-docker-compose/mysql/data:/var/mysql/lib
      - /root/docker/spring-cloud-01-docker-compose/mysql/initdb.d:/docker-entrypoint-initdb.d
    environment:
      - MYSQL_ROOT_PASSWORD=123456
      - MYSQL_ROOT_HOST=%
    networks:
      - spring-cloud-01
  eureka-server:
    image:  'zhangfan/eureka-server:1.0-SNAPSHOT'
    container_name:  eureka-server
    ports:
      - 8761:8761
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    networks:
      - spring-cloud-01
  auth:
    image:  'zhangfan/auth:1.0-SNAPSHOT'
    container_name:  auth
    ports:
      - 8904:8904
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    links:
      - mysql:mysql
      - eureka-server:eureka-server
    depends_on:
      - mysql
      - eureka-server
    networks:
      - spring-cloud-01
  config-server:
    image:  'zhangfan/config-server:1.0-SNAPSHOT'
    container_name:  config-server
    ports:
      - 8800:8800
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    links:
      - mysql:mysql
      - eureka-server:eureka-server
    depends_on:
      - mysql
      - eureka-server
      - auth
    networks:
      - spring-cloud-01
  zuul:
    image:  'zhangfan/zuul:1.0-SNAPSHOT'
    container_name:  zuul
    ports:
      - 8900:8900
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    links:
      - mysql:mysql
      - eureka-server:eureka-server
    depends_on:
      - mysql
      - eureka-server
      - auth
      - config-server
    networks:
      - spring-cloud-01

  user:
    image:  'zhangfan/user:1.0-SNAPSHOT'
    container_name:  user
    ports:
      - 8901:8901
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    links:
      - mysql:mysql
      - eureka-server:eureka-server
    depends_on:
      - mysql
      - eureka-server
      - auth
      - config-server
    networks:
      - spring-cloud-01
  food:
    image:  'zhangfan/food:1.0-SNAPSHOT'
    container_name:  food
    ports:
      - 8902:8902
    volumes:
      - /usr/local/jdk:/usr/local/jdk
    links:
      - mysql:mysql
      - eureka-server:eureka-server
    depends_on:
      - mysql
      - eureka-server
      - auth
      - config-server
    networks:
      - spring-cloud-01
networks:
  spring-cloud-01:
    driver:  bridge

4. 使用 docker-compose up -d 命令启动

docker-compose up -d

5. 使用 docker-compose ps 命令查看启动的容器列表

docker-compose ps

6. 使用 docker-compose stop 命令停止

docker-compose stop

7. 使用 docker-compose rm 命令删除容器

docker-compose rm

精确控制 docker 容器内程序启动顺序：
容器启动成功并不意味着容器内的程序启动完毕
所以需要精确控制程序的启动顺序

wait-for-it 的使用
1. 上传 wait-for-it.sh 文件,文件内容如下：

#!/usr/bin/env bash
#   Use this script to test if a given TCP host/port are available

WAITFORIT_cmdname=${0##*/}

echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "[email protected]" 1>&2; fi }

usage()
{
    cat << USAGE >&2
Usage:
    $WAITFORIT_cmdname host:port [-s] [-t timeout] [-- command args]
    -h HOST | --host=HOST       Host or IP under test
    -p PORT | --port=PORT       TCP port under test
                                Alternatively, you specify the host and port as host:port
    -s | --strict               Only execute subcommand if the test succeeds
    -q | --quiet                Don't output any status messages
    -t TIMEOUT | --timeout=TIMEOUT
                                Timeout in seconds, zero for no timeout
    -- COMMAND ARGS             Execute command with args after the test finishes
USAGE
    exit 1
}

wait_for()
{
    if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
        echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
    else
        echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout"
    fi
    WAITFORIT_start_ts=$(date +%s)
    while :
    do
        if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then
            nc -z $WAITFORIT_HOST $WAITFORIT_PORT
            WAITFORIT_result=$?
        else
            (echo > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1
            WAITFORIT_result=$?
        fi
        if [[ $WAITFORIT_result -eq 0 ]]; then
            WAITFORIT_end_ts=$(date +%s)
            echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds"
            break
        fi
        sleep 1
    done
    return $WAITFORIT_result
}

wait_for_wrapper()
{
    # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
    if [[ $WAITFORIT_QUIET -eq 1 ]]; then
        timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
    else
        timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT &
    fi
    WAITFORIT_PID=$!
    trap "kill -INT -$WAITFORIT_PID" INT
    wait $WAITFORIT_PID
    WAITFORIT_RESULT=$?
    if [[ $WAITFORIT_RESULT -ne 0 ]]; then
        echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT"
    fi
    return $WAITFORIT_RESULT
}
# process arguments
while [[ $# -gt 0 ]]
do
    case "$1" in
        *:* )
        WAITFORIT_hostport=(${1//:/ })
        WAITFORIT_HOST=${WAITFORIT_hostport[0]}
        WAITFORIT_PORT=${WAITFORIT_hostport[1]}
        shift 1
        ;;
        --child)
        WAITFORIT_CHILD=1
        shift 1
        ;;
        -q | --quiet)
        WAITFORIT_QUIET=1
        shift 1
        ;;
        -s | --strict)
        WAITFORIT_STRICT=1
        shift 1
        ;;
        -h)
        WAITFORIT_HOST="$2"
        if [[ $WAITFORIT_HOST == "" ]]; then break; fi
        shift 2
        ;;
        --host=*)
        WAITFORIT_HOST="${1#*=}"
        shift 1
        ;;
        -p)
        WAITFORIT_PORT="$2"
        if [[ $WAITFORIT_PORT == "" ]]; then break; fi
        shift 2
        ;;
        --port=*)
        WAITFORIT_PORT="${1#*=}"
        shift 1
        ;;
        -t)
        WAITFORIT_TIMEOUT="$2"
        if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi
        shift 2
        ;;
        --timeout=*)
        WAITFORIT_TIMEOUT="${1#*=}"
        shift 1
        ;;
        --)
        shift
        WAITFORIT_CLI=("[email protected]")
        break
        ;;
        --help)
        usage
        ;;
        *)
        echoerr "Unknown argument: $1"
        usage
        ;;
    esac
done

if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then
    echoerr "Error: you need to provide a host and port to test."
    usage
fi

WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-15}
WAITFORIT_STRICT=${WAITFORIT_STRICT:-0}
WAITFORIT_CHILD=${WAITFORIT_CHILD:-0}
WAITFORIT_QUIET=${WAITFORIT_QUIET:-0}
# check to see if timeout is from busybox?
WAITFORIT_TIMEOUT_PATH=$(type -p timeout)
WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH)
if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then
        WAITFORIT_ISBUSY=1
        WAITFORIT_BUSYTIMEFLAG="-t"

else
        WAITFORIT_ISBUSY=0
        WAITFORIT_BUSYTIMEFLAG=""
fi

if [[ $WAITFORIT_CHILD -gt 0 ]]; then
    wait_for
    WAITFORIT_RESULT=$?
    exit $WAITFORIT_RESULT
else
    if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then
        wait_for_wrapper
        WAITFORIT_RESULT=$?
    else
        wait_for
        WAITFORIT_RESULT=$?
    fi
fi

if [[ $WAITFORIT_CLI != "" ]]; then
    if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then
        echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess"
        exit $WAITFORIT_RESULT
    fi
    exec "${WAITFORIT_CLI[@]}"
else
    exit $WAITFORIT_RESULT
fi

     2. chmod +x  wait-for-it.sh 给文件一个可执行权限

chmod +x  wait-for-it.sh

    3. ./wait-for-it ip:port -- cmd 等待链接到 ip:port 或者超时才去执行 cmd 命令
        示例 1：

./wait-for-it.sh  -t 60 www.baidu.com:80 -- echo "hello baidu"

            链接到 www.baidu.com:80 或者超过 60s 连不上就执行 echo "hello baidu"
    
        示例 2：

./wait-for-it.sh  -t 60 --strict www.baidu.com:80 -- echo "hello baidu"

            60s 内链接到 www.baidu.com:80 执行 echo "hello baidu"，否则不执行        
    
        示例 3：

./wait-for-it -t 60 --strict mysql:3306 -- java -jar auth.jar

            60s 内链接到 mysql:3306 执行 echo "hello baidu"，否则不执行
    
拆分 docker-compose 为两个：
    一个启动 mysql 和 eureka-server
    
    一个启动 auth