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:7 MAINTAINER wangzhibin <wangzhibin> ENV USER="postgresql" / PASSWORD=123456 / GROUP=postgresql RUN useradd ${USER} / && chown -R ${USER}:${GROUP} /home/${USER} / && yum -y update && yum install -y iptables sudo net-tools iproute openssh-server openssh-clients which vim sudo crontabs #安装etcd COPY etcd/etcd /usr/sbin COPY etcd/etcdctl /usr/sbin #安装database COPY lib/ /home/${USER}/lib COPY include/ /home/${USER}/include COPY share/ /home/${USER}/share COPY bin/ /home/${USER}/bin/ COPY patroni/ /home/${USER}/patroni #安装vip-manager COPY vip-manager/vip-manager /usr/sbin #安装执行脚本 COPY runtime/ /home/${USER}/runtime COPY entrypoint.sh /sbin/entrypoint.sh #设置环境变量 ENV LD_LIBRARY_PATH /home/${USER}/lib ENV PATH /home/${USER}/bin:$PATH ENV ETCDCTL_API=3 #安装Patroni RUN 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/${USER} / && echo 'root:root123456' | chpasswd / && chmod 755 /sbin/etcd / && chmod 755 /sbin/etcdctl / && chmod 755 /sbin/vip-manager #设置Sudo RUN chmod 777 /etc/sudoers / && sed -i '/## Allow root to run any commands anywhere/a '${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/bash set -e # shellcheck source=runtime/functions source "/home/${USER}/runtime/function" configure_patroni
function
#!/bin/bash set -e source /home/${USER}/runtime/env-defaults source /home/${USER}/runtime/generatefile PG_DATADIR=/home/${USER}/pgdata PG_BINDIR=/home/${USER}/bin configure_patroni() { #生成配置文件 generate_etcd_conf generate_patroni_conf generate_vip_conf #启动etcd etcdcount=${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/bash set -e HOSTNAME="`hostname`" hostip=`ping ${HOSTNAME} -c 1 -w 1 | sed '1{s/[^(]*(//;s/).*//;q}'` #generate etcd generate_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 patroni generate_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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原创文章,作者:kepupublish,如若转载,请注明出处:https://blog.ytso.com/209444.html