Docker：docker

#Docker：docker| 来源: 网络整理| 查看: 265

前言

项目的技术栈vue+nodejs+redis+rabbitmq，由于vue服务依赖于redis+rabbitmq组件，所以需要先启动redis+rabbitmq组件，之后在运行vue服务。

属性设置 version: "3" services: ## redis redis: image: redis:latest ports: - "6379:6379" container_name: im-redis-compose restart: always command: redis-server --appendonly yes ## rabbitmq rabbitmq: image: rabbitmq:management ports: - "5672:5672" - "15672:15672" container_name: im-rabbitmq-compose environment: RABBITMQ_DEFAULT_USER: guest RABBITMQ_DEFAULT_PASS: guest RABBITMQ_DEFAULT_VHOST: my_vhost ## vue服务 backend: build: . links: - redis - rabbitmq container_name: im-server-compose restart: on-failure ## 设置启动顺序 depends_on: - rabbitmq - redis ports: - "3000:3000" 问题

运行 docker-compose up 命令的时候却报错，发现是vue服务的nodejs报的错，启动的时候报错connect refused，连接rabbitmq的时候出错；明明设置depends_on属性启动顺序，结果没有生效。

原因

depends_on 在启动 vue 服务容器前，并不会等待 rabbitmq 和 redis 这两个容器进入ready状态，而只是等到它们被启动状态(被启动，但不关心是否启动完成)；所以导致 rabbitmq 和 redis 这个两个容器虽然先启动，但是在 vue 服务容器之后才启动完成。

具体内容可以自己去看https://docs.docker.com/compose/startup-order/

解决方法

在容器启动命令执行前，跑一个shell脚本，这个脚本会去访问依赖服务的页面或者ping api来判断底层的服务有没有ready，随后再去启动真正的服务。

GitHub有现成的方案：wait-for

1. 修改vue服务的DockerFile文件(需要联网)

添加 RUN apt-get -q update && apt-get -qy install netcat 命令

#基础镜像 FROM nginx:stable ##定义工作目录 ENV WORK_PATH /etc/nginx # ##定义conf文件名 ENV CONF_FILE_NAME nginx.conf # ##更新apt-get 下载netcat服务 RUN apt-get -q update && apt-get -qy install netcat # ##删除原有配置文件 RUN rm $WORK_PATH/$CONF_FILE_NAME # ##复制新的配置文件 COPY ./$CONF_FILE_NAME $WORK_PATH/ # ##给shell文件赋读权限 RUN chmod a+r $WORK_PATH/$CONF_FILE_NAME

2. 将wait-for.sh复制到当前文件夹

wait-for.sh

查看代码 #!/bin/sh # The MIT License (MIT) # # Copyright (c) 2017 Eficode Oy # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in all # copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. VERSION="2.2.4" set -- "$@" -- "$TIMEOUT" "$QUIET" "$PROTOCOL" "$HOST" "$PORT" "$result" TIMEOUT=15 QUIET=0 # The protocol to make the request with, either "tcp" or "http" PROTOCOL="tcp" echoerr() { if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi } usage() { exitcode="$1" cat &2 Usage: $0 host:port|url [-t timeout] [-- command args] -q | --quiet Do not output any status messages -t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout Defaults to 15 seconds -v | --version Show the version of this tool -- COMMAND ARGS Execute command with args after the test finishes USAGE exit "$exitcode" } wait_for() { case "$PROTOCOL" in tcp) if ! command -v nc >/dev/null; then echoerr 'nc command is missing!' exit 1 fi ;; http) if ! command -v wget >/dev/null; then echoerr 'wget command is missing!' exit 1 fi ;; esac TIMEOUT_END=$(($(date +%s) + TIMEOUT)) while :; do case "$PROTOCOL" in tcp) nc -w 1 -z "$HOST" "$PORT" > /dev/null 2>&1 ;; http) wget --timeout=1 --tries=1 -q "$HOST" -O /dev/null > /dev/null 2>&1 ;; *) echoerr "Unknown protocol '$PROTOCOL'" exit 1 ;; esac result=$? if [ $result -eq 0 ] ; then if [ $# -gt 7 ] ; then for result in $(seq $(($# - 7))); do result=$1 shift set -- "$@" "$result" done TIMEOUT=$2 QUIET=$3 PROTOCOL=$4 HOST=$5 PORT=$6 result=$7 shift 7 exec "$@" fi exit 0 fi if [ $TIMEOUT -ne 0 -a $(date +%s) -ge $TIMEOUT_END ]; then echo "Operation timed out" >&2 exit 1 fi sleep 1 done } while :; do case "$1" in http://*|https://*) HOST="$1" PROTOCOL="http" shift 1 ;; *:* ) HOST=$(printf "%s\n" "$1"| cut -d : -f 1) PORT=$(printf "%s\n" "$1"| cut -d : -f 2) shift 1 ;; -v | --version) echo $VERSION exit ;; -q | --quiet) QUIET=1 shift 1 ;; -q-*) QUIET=0 echoerr "Unknown option: $1" usage 1 ;; -q*) QUIET=1 result=$1 shift 1 set -- -"${result#-q}" "$@" ;; -t | --timeout) TIMEOUT="$2" shift 2 ;; -t*) TIMEOUT="${1#-t}" shift 1 ;; --timeout=*) TIMEOUT="${1#*=}" shift 1 ;; --) shift break ;; --help) usage 0 ;; -*) QUIET=0 echoerr "Unknown option: $1" usage 1 ;; *) QUIET=0 echoerr "Unknown argument: $1" usage 1 ;; esac done if ! [ "$TIMEOUT" -ge 0 ] 2>/dev/null; then echoerr "Error: invalid timeout '$TIMEOUT'" usage 3 fi case "$PROTOCOL" in tcp) if [ "$HOST" = "" ] || [ "$PORT" = "" ]; then echoerr "Error: you need to provide a host and port to test." usage 2 fi ;; http) if [ "$HOST" = "" ]; then echoerr "Error: you need to provide a host to test." usage 2 fi ;; esac wait_for "$@" Footer

3. 修改docker-compose.yml文件

version: "3" services: redis: image: redis:latest ports: - "6379:6379" container_name: im-redis-compose restart: always command: redis-server --appendonly yes rabbitmq: image: rabbitmq:management ports: - "5672:5672" - "15672:15672" container_name: im-rabbitmq-compose environment: RABBITMQ_DEFAULT_USER: guest RABBITMQ_DEFAULT_PASS: guest RABBITMQ_DEFAULT_VHOST: my_vhost backend: build: . links: - redis - rabbitmq container_name: im-server-compose restart: on-failure depends_on: - rabbitmq - redis ports: - "3000:3000" ## 添加运行脚本的命令 command: sh -c './wait-for.sh rabbitmq:15672 -- npm run start'

文章转载至：https://segmentfault.com/a/1190000021504344

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