jdk 的配置
tar xf jdk-8u161-linux-x64.tar.gz -C /usr/local/
mv /usr/local/{jdk1.8.0_161,jdk}
tar xf zookeeper-3.4.14.tar.gz -C /usr/local/
mv /usr/local/{zookeeper-3.4.14,zookeeper}
cat /etc/profile.d/java.sh
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH:/usr/local/zookeeper/bin
exec bash
zk 的配置与启动
cp zoo_sample.cfg zoo.cfg [root@es ~]# mkdir -pv /zookeeper/data 创建数据目录 mkdir: 已创建目录 "/zookeeper" mkdir: 已创建目录 "/zookeeper/data" [root@es conf]# cat zoo.cfg # The number of milliseconds of each tick tickTime=2000 # The number of ticks that the initial # synchronization phase can take initLimit=10 # The number of ticks that can pass between # sending a request and getting an acknowledgement syncLimit=5 # the directory where the snapshot is stored. # do not use /tmp for storage, /tmp here is just # example sakes. dataDir=/zookeeper/data # the port at which the clients will connect clientPort=2181 # the maximum number of client connections. # increase this if you need to handle more clients #maxClientCnxns=60 # # Be sure to read the maintenance section of the # administrator guide before turning on autopurge. # # http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance # # The number of snapshots to retain in dataDir #autopurge.snapRetainCount=3 # Purge task interval in hours # Set to "0" to disable auto purge feature #autopurge.purgeInterval=1 [root@es ~]# zkServer.sh start ZooKeeper JMX enabled by default Usin config: /usr/local/zookeeper/bin/../conf/zoo.cfg Starting zookeeper ... STARTED
客户端的使用
[root@es ~]# zkCli.sh Connecting to localhost:2181 2020-06-04 17:47:58,152 [myid:] - INFO [main:Environment@109] - Client environment:zookeeper.version=3.5.5-390fe37ea45dee01bf87dc1c042b5e3dcce88653, built on 05/03/2019 12:07 GMT 2020-06-04 17:47:58,161 [myid:] - INFO [main:Environment@109] - Client environment:host.name=es 2020-06-04 17:47:58,161 [myid:] - INFO [main:Environment@109] - Client environment:java.version=1.8.0_161 2020-06-04 17:47:58,167 [myid:] - INFO [main:Environment@109] - Client environment:java.vendor=Oracle Corporation 2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:java.home=/usr/local/jdk/jre 2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:java.class.path=/usr/local/zookeeper/bin/../zookeeper-server/target/classes:/usr/local/zookeeper/bin/../bui ld/classes:/usr/local/zookeeper/bin/../zookeeper-server/target/lib/*.jar:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/zookeeper-jute-3.5.5.jar:/usr/local/zookeeper/bin/../lib/zookeeper-3.5.5.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.7.25.jar:/usr/local/zookeeper/bin/../lib/netty-all-4.1.29.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.17.jar:/usr/local/zookeeper/bin/../lib/json-simple-1.1.1.jar:/usr/local/zookeeper/bin/../lib/jline-2.11.jar:/usr/local/zookeeper/bin/../lib/jetty-util-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/jetty-servlet-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/jetty-server-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/jetty-security-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/jetty-io-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/jetty-http-9.4.17.v20190418.jar:/usr/local/zookeeper/bin/../lib/javax.servlet-api-3.1.0.jar:/usr/local/zookeeper/bin/../lib/jackson-databind-2.9.8.jar:/usr/local/zookeeper/bin/../lib/jackson-core-2.9.8.jar:/usr/local/zookeeper/bin/../lib/jackson-annotations-2.9.0.jar:/usr/local/zookeeper/bin/../lib/commons-cli-1.2.jar:/usr/local/zookeeper/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/bin/../zookeeper-*.jar:/usr/local/zookeeper/bin/../zookeeper-server/src/main/resources/lib/*.jar:/usr/local/zookeeper/bin/../conf:.:/usr/local/jdk/lib/dt.jar:/usr/local/jdk/lib/tools.jar2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:java.io.tmpdir=/tmp 2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:java.compiler=2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:os.name=Linux 2020-06-04 17:47:58,168 [myid:] - INFO [main:Environment@109] - Client environment:os.arch=amd64 2020-06-04 17:47:58,169 [myid:] - INFO [main:Environment@109] - Client environment:os.version=3.10.0-957.el7.x86_64 2020-06-04 17:47:58,169 [myid:] - INFO [main:Environment@109] - Client environment:user.name=root 2020-06-04 17:47:58,169 [myid:] - INFO [main:Environment@109] - Client environment:user.home=/root 2020-06-04 17:47:58,169 [myid:] - INFO [main:Environment@109] - Client environment:user.dir=/root 2020-06-04 17:47:58,169 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.free=52MB 2020-06-04 17:47:58,172 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.max=228MB 2020-06-04 17:47:58,172 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.total=57MB 2020-06-04 17:47:58,178 [myid:] - INFO [main:ZooKeeper@868] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWat cher@ea307972020-06-04 17:47:58,188 [myid:] - INFO [main:X509Util@79] - Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation 2020-06-04 17:47:58,207 [myid:] - INFO [main:ClientCnxnSocket@237] - [zk: localhost:2181(CONNECTED) 2] ls -R / / /zookeeper /zookeeper/config /zookeeper/quota [zk: localhost:2181(CONNECTED) 3] [zk: localhost:2181(CONNECTED) 3] create /app1 Created /app1 [zk: localhost:2181(CONNECTED) 4] create /app2 Created /app2 [zk: localhost:2181(CONNECTED) 5] create /app2/p_1 Created /app2/p_1 [zk: localhost:2181(CONNECTED) 6] create /app2/p_2 Created /app2/p_2 [zk: localhost:2181(CONNECTED) 7] ls -R / / /app1 /app2 /zookeeper /app2/p_1 /app2/p_2 /zookeeper/config /zookeeper/quota
实现锁的
终端1 [zk: localhost:2181(CONNECTED) 8] create -e /log Created /log 终端2 [zk: localhost:2181(CONNECTED) 0] create -e /log Node already exists: /log #创建失败 [zk: localhost:2181(CONNECTED) 1] stat -w /log 监控这个 cZxid = 0x7 ctime = Thu Jun 04 18:36:40 CST 2020 mZxid = 0x7 mtime = Thu Jun 04 18:36:40 CST 2020 pZxid = 0x7 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x1000036975a0000 dataLength = 0 numChildren = 0 终端1退出 [zk: localhost:2181(CONNECTED) 9] quit WATCHER:: WatchedEvent state:Closed type:None path:null 2020-06-04 18:44:07,928 [myid:] - INFO [main:ZooKeeper@1422] - Session: 0x1000036975a0000 closed 2020-06-04 18:44:07,929 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x1000036975a0000 终端2收到通知后创建 [zk: localhost:2181(CONNECTED) 2] WATCHER:: WatchedEvent state:SyncConnected type:NodeDeleted path:/log [zk: localhost:2181(CONNECTED) 2] create -e /log Created /log
分布式锁的实现
终端1创建master-m1节点 [zk: localhost:2181(CONNECTED) 0] create -e /master "m1:2223" Created /master 终端2 创建master-m2节点 [zk: localhost:2181(CONNECTED) 1] create -e /master "m2:2223" Node already exists: /master 终端2监控master这个node节点 [zk: localhost:2181(CONNECTED) 2] stat -w /master cZxid = 0xd ctime = Fri Jun 05 06:30:33 CST 2020 mZxid = 0xd mtime = Fri Jun 05 06:30:33 CST 2020 pZxid = 0xd cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x1000001d2cc0000 dataLength = 7 numChildren = 0 终端1退出；终端2收到通知 [zk: localhost:2181(CONNECTED) 1] quit WATCHER:: WatchedEvent state:Closed type:None path:null 2020-06-05 06:35:57,874 [myid:] - INFO [main:ZooKeeper@1422] - Session: 0x1000001d2cc0000 closed 2020-06-05 06:35:57,874 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x1000001d2cc0000 终端2收到通知后就可以继续创建 [zk: localhost:2181(CONNECTED) 3] WATCHER:: WatchedEvent state:SyncConnected type:NodeDeleted path:/master [zk: localhost:2181(CONNECTED) 3] create -e /master "m2:2223" Created /master
主节点如何监控从节点的状态
终端1 [zk: localhost:2181(CONNECTED) 4] create /workers 创建组 Created /workers 监控 [zk: localhost:2181(CONNECTED) 6] ls -w /workers 监控组 [] 终端2 [zk: localhost:2181(CONNECTED) 0] create -e /workers/w1 "w1:2224" Created /workers/w1 终端1查看收到的通知 [zk: localhost:2181(CONNECTED) 7] WATCHER:: WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/workers 监控并查看这个组 [zk: localhost:2181(CONNECTED) 7] ls -w /workers [w1] 终端2 在添加一个节点 [zk: localhost:2181(CONNECTED) 1] create -e /workers/w2 "w2:2224" Created /workers/w2 终端1查看通知并查看监控组成员 [zk: localhost:2181(CONNECTED) 8] WATCHER:: WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/workers [zk: localhost:2181(CONNECTED) 8] ls -w /workers [w1, w2]