小编给大家分享一下如何解决Docker-compose中depends_on顺序的问题,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
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。
将需要的 jar文件删除到虚拟机或服务器。接下来编写 dockerfile
和docker-compose
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
version: '3.0' services: nacos: image: nacos/nacos-server:1.1.4 container_name: nacos ports: - "8848:8848" environment: MODE: standalone # nacos 单节点运行 course: build: /root/ container_name: course ports: - "18002:18002" depends_on: - nacos command: ["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 update
和 apt-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" "$result" TIMEOUT=60 QUIET=0 # The protocol to make the request with, either "tcp" or "http" PROTOCOL="tcp" echoerr() { if [ "$QUIET" -ne 1 ]; then printf "%s/n" "$*" 1>&2; fi } usage() { exitcode="$1" cat << USAGE >&2 Usage: $0 host:port|url [-t timeout] [-- command args] -q | --quiet Do not output any status messages -t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout -- COMMAND ARGS Execute command with args after the test finishes USAGE exit "$exitcode" } wait_for() { case "$PROTOCOL" in tcp) if ! command -v nc >/dev/null; then echoerr 'nc command is missing!' exit 1 fi ;; wget) if ! command -v wget >/dev/null; then echoerr 'wget command is missing!' exit 1 fi ;; esac while :; do case "$PROTOCOL" in tcp) 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 ;; 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 [ "$TIMEOUT" -le 0 ]; then break fi TIMEOUT=$((TIMEOUT - 1)) sleep 1 done echo "Operation timed out" >&2 exit 1 } 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 ;; -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 [ "$HOST" = "" ]; then echoerr "Error: you need to provide a host to test." usage 2 fi ;; esac wait_for "$@"
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原创文章,作者:Maggie-Hunter,如若转载,请注明出处:https://blog.ytso.com/209390.html