浅谈Docker-compose中的depends_on顺序的问题解决

使用depends_on进行容器排序时并不能完美的解决容器之间的依赖问题,原因是因为 depends_on只能保证容器进入到 运行状态而不是完全状态(不知道怎么描述了)。
网上已经列出来了解决方法,使用 wait-for-it或者 wait-for,在启动时对需要优先启动的容器进行访问,当可以访问成功时在启动,但是都不够详细,甚至很多都是同样的内容,(这里吐槽一下环境真乱)。
可能我比较笨,花了一天才解决,在这里记录下来。
我使用的是 wait-forwait-for-it.sh我测试的时候了出现了保错所以没用。
正文: 需求是要将一个 打包好的 ar文件注册到nacos中,但是nacos启动较慢,就需要进行顺序的设置。
浅谈Docker-compose中的depends_on顺序的问题解决
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将需要的 jar文件删除到虚拟机或服务器。接下来编写 dockerfiledocker-compose
浅谈Docker-compose中的depends_on顺序的问题解决
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FROM openjdk:8-jre // 基于 openjdk COPY wait-for .// 将 wait-for 拷贝到虚拟机中RUN apt-get update // 更新源,RUN apt-get install netcat -y // 安装 netcat, wait-for 需要使用到WORKDIR /app// 设置落脚点ADD course.jar course.jar // 将 jar 文件 添加到 虚拟机中EXPOSE 8002// 需要暴露的端口

我的配置是以图片为准的,代码块中的是为了更好的理解 ,想来应该没有差别。
docker-compose
浅谈Docker-compose中的depends_on顺序的问题解决
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version: '3.0'services:nacos:image: nacos/nacos-server:1.1.4container_name: nacosports:- "8848:8848"environment:MODE: standalone# nacos 单节点运行course:build: /root/container_name: courseports:- "18002:18002"depends_on:- nacoscommand: ["sh","wait-for","nacos:8848","--","java","-jar","course.jar"]

这里就不做过多的解释了,与平常相差不大。
我之前查找到的帖子中,没有贴出dockerfile文件在这里最重要的就是,将 wait-for文件拷贝到虚拟机中,因为在 docker-compose中配置的command所使用的 文件是容器中的,如果你没有拷贝那么将找不到文件。然后是 apt-get updateapt-get install netcat -y则是安装 wait-for运行的环境
我的wait-for代码,26行为超时时间,刚开始是15,但是时间太短了 容器超时我就设置为了 60,这是我唯一跟原来不一样的地方,之后就可以测试运行了
#!/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.set -- "$@" -- "$TIMEOUT" "$QUIET" "$PROTOCOL" "$HOST" "$PORT" "$result"TIMEOUT=60QUIET=0# The protocol to make the request with, either "tcp" or "http"PROTOCOL="tcp"echoerr() {if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi}usage() {exitcode="$1"cat << USAGE >&2Usage:$0 host:port|url [-t timeout] [-- command args]-q | --quietDo not output any status messages-t TIMEOUT | --timeout=timeoutTimeout in seconds, zero for no timeout-- COMMAND ARGSExecute command with args after the test finishesUSAGEexit "$exitcode"}wait_for() {case "$PROTOCOL" intcp)if ! command -v nc >/dev/null; thenechoerr 'nc command is missing!'exit 1fi; ; wget)if ! command -v wget >/dev/null; thenechoerr 'wget command is missing!'exit 1fi; ; esacwhile :; docase "$PROTOCOL" intcp) nc -w 1 -z "$HOST" "$PORT" > /dev/null 2>&1; ; http)wget --timeout=1 -q "$HOST" -O /dev/null > /dev/null 2>&1 ; ; *)echoerr "Unknown protocol '$PROTOCOL'"exit 1; ; esacresult=$?if [ $result -eq 0 ] ; thenif [ $# -gt 7 ] ; thenfor result in $(seq $(($# - 7))); doresult=$1shiftset -- "$@" "$result"doneTIMEOUT=$2 QUIET=$3 PROTOCOL=$4 HOST=$5 PORT=$6 result=$7shift 7exec "$@"fiexit 0fiif [ "$TIMEOUT" -le 0 ]; thenbreakfiTIMEOUT=$((TIMEOUT - 1))sleep 1doneecho "Operation timed out" >&2exit 1}while :; docase "$1" inhttp://*|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; ; -q | --quiet)QUIET=1shift 1; ; -q-*)QUIET=0echoerr "Unknown option: $1"usage 1; ; -q*)QUIET=1result=$1shift 1set -- -"${result#-q}" "$@"; ; -t | --timeout)TIMEOUT="$2"shift 2; ; -t*)TIMEOUT="${1#-t}"shift 1; ; --timeout=*)TIMEOUT="${1#*=}"shift 1; ; --)shiftbreak; ; --help)usage 0; ; -*)QUIET=0echoerr "Unknown option: $1"usage 1; ; *)QUIET=0echoerr "Unknown argument: $1"usage 1; ; esacdoneif ! [ "$TIMEOUT" -ge 0 ] 2>/dev/null; thenechoerr "Error: invalid timeout '$TIMEOUT'"usage 3ficase "$PROTOCOL" intcp)if [ "$HOST" = "" ] || [ "$PORT" = "" ]; thenechoerr "Error: you need to provide a host and port to test."usage 2fi; ; http)if [ "$HOST" = "" ]; thenechoerr "Error: you need to provide a host to test."usage 2fi; ; esacwait_for "$@"

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