• [转] etcd 搭建与使用


    [From] https://blog.csdn.net/ShouTouDeXingFu/article/details/81167302

    etcd

    1、下载etcd二进制文件包
             https://github.com/coreos/etcd/releases/download/v3.1.3/etcd-v3.1.3-linux-amd64.tar.gz

    2、解压缩etcd-v3.1.3-linux-amd64.tar.gz,将其中的etcd和etcdctl两个可执行文件复制到各节点的/usr/bin目录
    3、在各节点创建etcd的数据目录
             mkdir -p /data/etcd

             mkdir /etc/etcd

    4、在每个节点上创建etcd的systemd unit文件/usr/lib/systemd/system/etcd.service 和  /etc/etcd/etcd.conf  
      

    etcd.service 

    [Unit]
    
    Description=Etcd Server
    
    After=network.target
    
    After=network-online.target
    
    Wants=network-online.target
    
    Documentation=https://github.com/coreos
    
    [Service]
    
    Type=notify
    
    WorkingDirectory=/var/lib/etcd/
    
    EnvironmentFile=-/etc/etcd/etcd.conf
    
    ExecStart=/usr/bin/etcd 
    
    --name ${ETCD_NAME} 
    
    --cert-file=${ETCD_CERT_FILE} 
    
    --key-file=${ETCD_KEY_FILE} 
    
    --peer-cert-file=${ETCD_PEER_CERT_FILE} 
    
    --peer-key-file=${ETCD_PEER_KEY_FILE} 
    
    --trusted-ca-file=${ETCD_TRUSTED_CA_FILE} 
    
    --peer-trusted-ca-file=${ETCD_PEER_TRUSTED_CA_FILE} 
    
    --initial-advertise-peer-urls ${ETCD_INITIAL_ADVERTISE_PEER_URLS} 
    
    --listen-peer-urls ${ETCD_LISTEN_PEER_URLS} 
    
    --listen-client-urls ${ETCD_LISTEN_CLIENT_URLS} 
    
    --advertise-client-urls ${ETCD_ADVERTISE_CLIENT_URLS} 
    
    --initial-cluster-token ${ETCD_INITIAL_CLUSTER_TOKEN} 
    
    --initial-cluster ${ETCD_INITIAL_CLUSTER} 
    
    --initial-cluster-state ${ETCD_INITIAL_CLUSTER_STATE} 
    
    --data-dir=${ETCD_DATA_DIR}
    
    Restart=on-failure
    
    RestartSec=5
    
    LimitNOFILE=65536
    
    [Install]
    
    WantedBy=multi-user.target

    etcd.conf    etcd集群中配置文件标红的配置不一样,拷贝出来修改即可

    ETCD_NAME="etcd1"
    
    #20180108 by lys
    #ETCD_CERT_FILE="/etc/k8s/kubernetes.pem"
    #ETCD_KEY_FILE="/etc/k8s/kubernetes-key.pem"
    #ETCD_PEER_CERT_FILE="/etc/k8s/kubernetes.pem"
    #ETCD_PEER_KEY_FILE="/etc/k8s/kubernetes-key.pem"
    #ETCD_TRUSTED_CA_FILE="/etc/k8s/ca.pem"
    #ETCD_PEER_TRUSTED_CA_FILE="/etc/k8s/ca.pem"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd1.server.biz:2380"
    ETCD_LISTEN_PEER_URLS="http://etcd1.server.biz:2380"
    ETCD_LISTEN_CLIENT_URLS="http://etcd1.server.biz:2379,http://127.0.0.1:2379"
    ETCD_ADVERTISE_CLIENT_URLS="http://etcd1.server.biz:2379"
    
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-0"
    ETCD_INITIAL_CLUSTER="etcd1=http://etcd1.server.biz:2380,etcd2=http://etcd2.server.biz:2380,etcd3=http://etcd3.server.biz:2380"
    ETCD_INITIAL_CLUSTER_STATE="new"
    ETCD_DATA_DIR="/data/etcd"

    配置信息说明
    上面在启动参数中指定了etcd的工作目录和数据目录是/data/etcd
    --cert-file和--key-file分别指定etcd的公钥证书和私钥
    --peer-cert-file和--peer-key-file分别指定了etcd的Peers通信的公钥证书和私钥。
    --trusted-ca-file指定了客户端的CA证书
    --peer-trusted-ca-file指定了Peers的CA证书
    --initial-cluster-state new表示这是新初始化集群,--name指定的参数值必须在--initial-cluster中
     

    5、启动etcd
        systemctl daemon-reload

        systemctl enable etcd

        systemctl start etcd

        systemctl status etcd

    6、检查集群是否健康,在任一节点执行
                  export ETCDCTL_API=3         

    etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379   member list

           

    etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379  endpoint status  -w table

    etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379  endpoint health  -w table

              

        sudo journalctl -u etcd.service -l --no-pager|less   查看日志

    7、etcd集群成员扩容增加
    etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379 member add etcd4   --peer-urls=http://etcd4.server.biz:2380 
    Member 5b316fb0b94e59f8 added to cluster f0364a493c8924dc

    ETCD_NAME="etcd4"
    ETCD_INITIAL_CLUSTER="etcd1=http://etcd1.server.biz:2380,etcd3=http://etcd3.server.biz:2380,etcd2=http://etcd2.server.biz:2380,etcd4=http://etcd4.server.biz:2380"
    ETCD_INITIAL_CLUSTER_STATE="existing"

              此时,集群会为目标节点生成一个唯一的member ID  

    注意:新节点加入集群是作为一个全新的节点加入,如果data-dir有数据,etcd启动时会读取己经存在的数据,启动时仍然用的老member ID,也会造成,集群不无法加入,所以一定要清空新节点的data-dir   
    新扩容的etcd机器的etcd.conf中配置修改为 ETCD_INITIAL_CLUSTER_STATE="existing"
    删除 rm-rf  /data/etcd/*
    启动etcd服务即可
     

    常见问题
    1) systemd: Failed at step CHDIR spawning /usr/bin/etcd: No such file or directory
        通过查看ll /usr/bin/etcd  启动文件是存在的,后来发现etcd.service里面指定了WorkingDirectory=/var/lib/etcd/  没有创建对应目录导致,创建了/var/lib/etcd/ 目录应用启动成功
     

    2)etcd 添加集群成员报错
    Jul 23 16:58:25 bjzw_82_137 etcd: failed to process raft message (raft: stopped)
    Jul 23 16:58:25 bjzw_82_137 etcd: failed to find member c79c567db2d16966 in cluster f0364a493c8924dc
    Jul 23 16:58:25 bjzw_82_137 etcd: failed to find member c79c567db2d16966 in cluster f0364a493c8924dc
    Jul 23 16:58:25 bjzw_82_137 etcd: failed to find member b13dd19d11c8d25d in cluster f0364a493c8924dc
    Jul 23 16:58:25 bjzw_82_137 etcd: failed to find member b13dd19d11c8d25d in cluster f0364a493c8924dc
    需要将etcd.conf中的配置修改为

    ETCD_INITIAL_CLUSTER_STATE="existing"
    ---------------------
    作者:起航90
    来源:CSDN
    原文:https://blog.csdn.net/ShouTouDeXingFu/article/details/81167302
    版权声明:本文为博主原创文章,转载请附上博文链接!

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  • 原文地址:https://www.cnblogs.com/pekkle/p/9983723.html
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