docker 报错：x509: certificate has expired or is not yet valid
环境：ubuntu 14.04程序：docker 1.6
下载镜像报错：
# docker pull centos:centos5
Pulling repository centos
FATA Get https://index.docker.io/v1/repositories/library/centos/images: x509: certificate has expired or is not yet valid
这种错误，一般都是本地系统时间错误导致报错证书过期，所以先查看本地系统时间
# date "+%Y-%m-%d"#系统时间2月15日，而正确时间应该是4月17日，所以很大可能就是该原因
2015-02-15
解决：
# ntpdate cn.pool.ntp.org #同步一下时间
17 Apr 17:40:45 ntpdate: step time server 202.112.29.82 offset 5262859.193967 sec
# date "+%Y-%m-%d" #时间同步成功
2015-04-17
# docker pull centos:centos5 #成功下载镜像，问题解决
centos5: Pulling from centos
861c710fef70: Downloading [> ] 1.075 MB/87.03 MB
511136ea3c5a: Already exists
5b12ef8fd570: Already exists
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