1、虚拟机开机黑屏
无法进入登录linux，提示the configuration defaults for gnome power manager have not been installed correctly
可能是磁盘满造成的
使用命令
find / -size +200M -exec du -h {} \;查看大于200M的文件（首选删除日志文件）。
查询出来大文件删除即可，测试可用，如果不是太多大文件导致磁盘满，可以使用下一种方式
以管理员身份运行CMD-输入netsh winsock reset 重启即可，
2中方式大家可以试试
2、启动zk报错
he accepted epoch, d4 is less than the current epoch, d5
可能是内存不足：部署zookeeper的服务器磁盘满了，引起服务异常，
2018-05-07 10:33:58,556 [myid:3] - INFO [main:FileSnap@83] - Reading snapshot /opt/data/zookeeper/version-2/snapshot.1900356f19
2018-05-07 10:33:58,966 [myid:3] - ERROR [main:Util@239] - Last transaction was partial.
2018-05-07 10:33:58,968 [myid:3] - ERROR [main:QuorumPeer@648] - Unable to load database on disk
java.io.IOException: The accepted epoch, 19 is less than the current epoch, 3a
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:591)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:164)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
2018-05-07 10:33:58,970 [myid:3] - ERROR [main:QuorumPeerMain@89] - Unexpected exception, exiting abnormally
java.lang.RuntimeException: Unable to run quorum server
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:649)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:591)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:164)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
Caused by: java.io.IOException: The accepted epoch, 19 is less than the current epoch, 3a
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
... 4 more经过网上查询，得到解决方法：
将zookeeper的version-2目录备份一份，再重新创建一个新的version-2目录，然后重新启动zookeeper。
mv version-2.tmp
mkdir version-2
重启即可，
希望可以帮助到大家