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分析Docker容器中的Patroni

发表于：2025-01-20 作者：千家信息网编辑

千家信息网最后更新 2025年01月20日，本篇内容介绍了"分析Docker容器中的Patroni"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

千家信息网最后更新 2025年01月20日分析Docker容器中的Patroni

本篇内容介绍了"分析Docker容器中的Patroni"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

etcd作为分布式注册中心、进行集群选主工作；vip-manager为主节点设置漂移IP；patroni负责引导集群的创建、运行和管理工作，并可以使用patronictl来进行终端访问。

具体流程：
1、首先启动etcd集群，本例中etcd数量为3个。
2、检测etcd集群状态健康后，启动patroni并竞争选主，其他跟随节点进行数据同步过程。
3、启动vip-manager，通过访问etcd集群中/ S E R V I C E N A M E / {SERVICE_NAME}/ SERVICENAME/{CLUSTER_NAME}/leader键中的具体值，判断当前节点是否为主节点ip，如果是则为该节点设置vip，提供对外读写服务。
注：建议真实环境下将etcd部署到独立容器上，对外提供服务。

创建镜像

文件结构

其中Dockerfile为镜像主文件，docker服务通过该文件在本地仓库创建镜像；entrypoint.sh为容器入口文件，负责业务逻辑的处理；function为执行业务方法的入口文件，负责启动etcd，监控etcd集群状态、启动patroni和vip-manager；generatefile为整个容器生成对应的配置文件，包括etcd、patroni及vip-mananger。

目录结构大致如图所示：

注：数据库安装包和patroni安装包请自行构建。

DockerFile

FROM centos:7MAINTAINER wangzhibin ENV USER="postgresql" \    PASSWORD=123456 \    GROUP=postgresql         RUN useradd ${USER} \       && chown -R ${USER}:${GROUP} /home/${USER} \       && yum -y update && yum install -y iptables sudo net-tools iproute  openssh-server openssh-clients which vim sudo crontabs#安装etcdCOPY etcd/etcd /usr/sbinCOPY etcd/etcdctl /usr/sbin#安装databaseCOPY lib/ /home/${USER}/libCOPY include/ /home/${USER}/includeCOPY share/ /home/${USER}/shareCOPY bin/ /home/${USER}/bin/COPY patroni/ /home/${USER}/patroni#安装vip-managerCOPY vip-manager/vip-manager /usr/sbin#安装执行脚本COPY runtime/ /home/${USER}/runtimeCOPY entrypoint.sh /sbin/entrypoint.sh#设置环境变量ENV LD_LIBRARY_PATH /home/${USER}/libENV PATH /home/${USER}/bin:$PATHENV ETCDCTL_API=3#安装PatroniRUN yum -y install epel-release python-devel  && yum -y install python-pip \    && pip install /home/${USER}/patroni/1/pip-20.3.3.tar.gz \    && pip install /home/${USER}/patroni/1/psycopg2-2.8.6-cp27-cp27mu-linux_x86_64.whl \    && pip install --no-index --find-links=/home/${USER}/patroni/2/ -r /home/${USER}/patroni/2/requirements.txt \    && pip install /home/${USER}/patroni/3/patroni-2.0.1-py2-none-any.whl#修改执行权限RUN chmod 755 /sbin/entrypoint.sh \ && mkdir /home/${USER}/etcddata \&& chown -R ${USER}:${GROUP} /home/${USER} \&& echo 'root:root123456' | chpasswd \&& chmod 755 /sbin/etcd \&& chmod 755 /sbin/etcdctl \&& chmod 755 /sbin/vip-manager#设置SudoRUN chmod 777 /etc/sudoers \       && sed -i '/## Allow root to run any commands anywhere/a '${USER}' ALL=(ALL) NOPASSWD:ALL' /etc/sudoers \       && chmod 440 /etc/sudoers#切换用户USER ${USER}#切换工作目录WORKDIR /home/${USER}#启动入口程序CMD ["/bin/bash", "/sbin/entrypoint.sh"]

entrypoint.sh

#!/bin/bashset -e# shellcheck source=runtime/functionssource "/home/${USER}/runtime/function"configure_patroni

function

#!/bin/bashset -esource /home/${USER}/runtime/env-defaultssource /home/${USER}/runtime/generatefilePG_DATADIR=/home/${USER}/pgdataPG_BINDIR=/home/${USER}/binconfigure_patroni(){    #生成配置文件    generate_etcd_conf    generate_patroni_conf    generate_vip_conf    #启动etcd    etcdcount=${ETCD_COUNT}    count=0    ip_temp=""    array=(${HOSTLIST//,/ })    for host in ${array[@]}    do        ip_temp+="http://${host}:2380,"    done    etcd --config-file=/home/${USER}/etcd.yml >/home/${USER}/etcddata/etcd.log 2>&1 &    while [ $count -lt $etcdcount ]    do      line=(`etcdctl --endpoints=${ip_temp%?} endpoint health -w json`)      count=`echo $line | awk -F"\"health\":true" '{print NF-1}'`      echo "waiting etcd cluster"      sleep 5    done    #启动patroni    patroni /home/${USER}/postgresql.yml >  /home/${USER}/patroni/patroni.log 2>&1 &    #启动vip-manager    sudo vip-manager --config /home/${USER}/vip.yml}

generatefile

#!/bin/bashset -eHOSTNAME="`hostname`"hostip=`ping ${HOSTNAME} -c 1 -w 1 | sed '1{s/[^(]*(//;s/).*//;q}'`#generate etcdgenerate_etcd_conf(){    echo "name : ${HOSTNAME}" >> /home/${USER}/etcd.yml    echo "data-dir: /home/${USER}/etcddata" >> /home/${USER}/etcd.yml    echo "listen-client-urls: http://0.0.0.0:2379" >> /home/${USER}/etcd.yml    echo "advertise-client-urls: http://${hostip}:2379" >> /home/${USER}/etcd.yml    echo "listen-peer-urls: http://0.0.0.0:2380" >> /home/${USER}/etcd.yml    echo "initial-advertise-peer-urls: http://${hostip}:2380" >> /home/${USER}/etcd.yml    ip_temp="initial-cluster: "    array=(${HOSTLIST//,/ })      for host in ${array[@]}    do            ip_temp+="${host}=http://${host}:2380,"     done    echo  ${ip_temp%?} >> /home/${USER}/etcd.yml    echo "initial-cluster-token: etcd-cluster-token" >> /home/${USER}/etcd.yml    echo "initial-cluster-state: new" >> /home/${USER}/etcd.yml}#generate patronigenerate_patroni_conf(){  echo "scope: ${CLUSTER_NAME}" >> /home/${USER}/postgresql.yml  echo "namespace: /${SERVICE_NAME}/ " >> /home/${USER}/postgresql.yml  echo "name: ${HOSTNAME} " >> /home/${USER}/postgresql.yml  echo "restapi: " >> /home/${USER}/postgresql.yml   echo "  listen: ${hostip}:8008 " >> /home/${USER}/postgresql.yml   echo "  connect_address: ${hostip}:8008 " >> /home/${USER}/postgresql.yml  echo "etcd: " >> /home/${USER}/postgresql.yml  echo "  host: ${hostip}:2379 " >> /home/${USER}/postgresql.yml  echo "  username: ${ETCD_USER} " >>  /home/${USER}/postgresql.yml  echo "  password: ${ETCD_PASSWD} " >> /home/${USER}/postgresql.yml  echo "bootstrap: " >> /home/${USER}/postgresql.yml  echo "  dcs: " >> /home/${USER}/postgresql.yml  echo "    ttl: 30 " >> /home/${USER}/postgresql.yml  echo "    loop_wait: 10  " >> /home/${USER}/postgresql.yml  echo "    retry_timeout: 10   " >> /home/${USER}/postgresql.yml  echo "    maximum_lag_on_failover: 1048576 " >> /home/${USER}/postgresql.yml  echo "    postgresql: " >>  /home/${USER}/postgresql.yml  echo "      use_pg_rewind: true  " >>  /home/${USER}/postgresql.yml  echo "      use_slots: true  " >>  /home/${USER}/postgresql.yml  echo "      parameters:  " >>  /home/${USER}/postgresql.yml  echo "  initdb:  " >>  /home/${USER}/postgresql.yml  echo "  - encoding: UTF8  " >>  /home/${USER}/postgresql.yml  echo "  - data-checksums  " >>  /home/${USER}/postgresql.yml  echo "  pg_hba:   " >>  /home/${USER}/postgresql.yml  echo "  - host replication ${USER} 0.0.0.0/0 md5  " >>  /home/${USER}/postgresql.yml  echo "  - host all all 0.0.0.0/0 md5  " >>  /home/${USER}/postgresql.yml  echo "postgresql:  " >>  /home/${USER}/postgresql.yml  echo "  listen: 0.0.0.0:5432  " >>  /home/${USER}/postgresql.yml  echo "  connect_address: ${hostip}:5432  " >>  /home/${USER}/postgresql.yml  echo "  data_dir: ${PG_DATADIR}  " >>  /home/${USER}/postgresql.yml  echo "  bin_dir: ${PG_BINDIR}  " >>  /home/${USER}/postgresql.yml  echo "  pgpass: /tmp/pgpass  " >>  /home/${USER}/postgresql.yml  echo "  authentication:  " >>  /home/${USER}/postgresql.yml  echo "    replication:  " >>  /home/${USER}/postgresql.yml  echo "      username: ${USER}  " >>  /home/${USER}/postgresql.yml  echo "      password: ${PASSWD}  " >>  /home/${USER}/postgresql.yml  echo "    superuser:  " >>  /home/${USER}/postgresql.yml  echo "      username: ${USER}  " >>  /home/${USER}/postgresql.yml  echo "      password: ${PASSWD}  " >>  /home/${USER}/postgresql.yml  echo "    rewind:  " >>  /home/${USER}/postgresql.yml  echo "      username: ${USER}  " >>  /home/${USER}/postgresql.yml  echo "      password: ${PASSWD}  " >>  /home/${USER}/postgresql.yml  echo "  parameters:  " >>  /home/${USER}/postgresql.yml  echo "    unix_socket_directories: '.'  " >>  /home/${USER}/postgresql.yml  echo "    wal_level: hot_standby  " >>  /home/${USER}/postgresql.yml  echo "    max_wal_senders: 10  " >>  /home/${USER}/postgresql.yml  echo "    max_replication_slots: 10  " >>  /home/${USER}/postgresql.yml  echo "tags:  " >>  /home/${USER}/postgresql.yml  echo "    nofailover: false  " >>  /home/${USER}/postgresql.yml  echo "    noloadbalance: false  " >>  /home/${USER}/postgresql.yml  echo "    clonefrom: false  " >>  /home/${USER}/postgresql.yml  echo "    nosync: false  " >>  /home/${USER}/postgresql.yml}#........ 省略部分内容

构建镜像

docker build -t patroni .

运行镜像

运行容器节点1：
docker run --privileged --name patroni1 -itd --hostname patroni1 --net my_net3 --restart always --env 'CLUSTER_NAME=patronicluster' --env 'SERVICE_NAME=service' --env 'ETCD_USER=etcduser' --env 'ETCD_PASSWD=etcdpasswd' --env 'PASSWD=zalando' --env 'HOSTLIST=patroni1,patroni2,patroni3' --env 'VIP=172.22.1.88' --env 'NET_DEVICE=eth0' --env 'ETCD_COUNT=3' patroni
运行容器节点2：
docker run --privileged --name patroni2 -itd --hostname patroni2 --net my_net3 --restart always --env 'CLUSTER_NAME=patronicluster' --env 'SERVICE_NAME=service' --env 'ETCD_USER=etcduser' --env 'ETCD_PASSWD=etcdpasswd' --env 'PASSWD=zalando' --env 'HOSTLIST=patroni1,patroni2,patroni3' --env 'VIP=172.22.1.88' --env 'NET_DEVICE=eth0' --env 'ETCD_COUNT=3' patroni
运行容器节点3：
docker run --privileged --name patroni3 -itd --hostname patroni3 --net my_net3 --restart always --env 'CLUSTER_NAME=patronicluster' --env 'SERVICE_NAME=service' --env 'ETCD_USER=etcduser' --env 'ETCD_PASSWD=etcdpasswd' --env 'PASSWD=zalando' --env 'HOSTLIST=patroni1,patroni2,patroni3' --env 'VIP=172.22.1.88' --env 'NET_DEVICE=eth0' --env 'ETCD_COUNT=3' patroni

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