背景：
在部署fabric时，三个本地虚拟机节点，一个远程服务器节点，相应的登陆用户名已经清理干净的情况下，在启动时出现证书错误：
$ ./startPeer.sh
2017/08/02 09:49:56 setting Number of procs to -1, was 1
09:49:57.340675 [main] main -> INFO 001 User defined config file path: /home/gds/Goworkspace/fabric_deploy/xingye_test/vp1/
09:49:57.343540 [nodeCmd] serve -> INFO 002 Security enabled status: true
09:49:57.344106 [nodeCmd] serve -> INFO 004 Privacy enabled status: false
09:49:57.344807 [db] open -> INFO 005 Setting rocksdb maxLogFileSize to 10485760
09:49:57.345399 [db] open -> INFO 006 Setting rocksdb keepLogFileNum to 10
09:49:57.343998 [eventhub_producer] start -> INFO 003 event processor started
09:49:57.373895 [crypto] RegisterValidator -> INFO 007 Registering validator [test_vp1] with name [test_vp1]...
09:49:57.835920 [crypto] Errorf -> ERRO 008 [validator.test_vp1] Failed checking signing enrollment certificate for signing: [x509: certificate has expired or is not yet valid]
09:49:57.836090 [crypto] Errorf -> ERRO 009 [validator.test_vp1] Failed getting enrollment certificate [id=test_vp1]: [x509: certificate has expired or is not yet valid]
09:49:57.836114 [crypto] Errorf -> ERRO 00a [validator.test_vp1] Failed retrieving enrollment data [x509: certificate has expired or is not yet valid].
09:49:57.836131 [crypto] Errorf -> ERRO 00b [validator.test_vp1] Failed registering node crypto engine [x509: certificate has expired or is not yet valid].
09:49:57.836231 [crypto] Errorf -> ERRO 00c [validator.test_vp1] Failed registering peer [test_vp1]: [x509: certificate has expired or is not yet valid]
09:49:57.836243 [crypto] Errorf -> ERRO 00d [validator.test_vp1] Failed registering [test_vp1]: [x509: certificate has expired or is not yet valid]
09:49:57.836252 [crypto] RegisterValidator -> ERRO 00e Failed registering validator [test_vp1] with name [test_vp1] [x509: certificate has expired or is not yet valid].
Error: x509: certificate has expired or is not yet valid
解决办法：
这个问题基本上是因为证书出现过期导致，查看虚拟机和远程服务器的时间是否同步：
date
如果时间不一致，则执行：
ntpdate cn.pool.ntp.org
