Github git clone error: Peer's Certificate has expired

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今天用github 克隆Tensorflow公共代码库，报 ‘Peer’s Certificate has expired’ 错误

[cos@localhost github]$ git clone --recurse-submodules https://github.com/tensorflow/tensorflowCloning into 'tensorflow'...fatal: unable to access 'https://github.com/tensorflow/tensorflow/': Peer's Certificate has expired.

因为很久没有使用Github了，也不知道哪里有问题。开始想设置成SSH，后来发现可能是虚拟机时间没有同步，于是安装ntp同步时间，我的系统是centos7：

[cos@localhost github]$ dateWed Aug 26 04:07:42 EDT 2015[cos@localhost scripts]$ sudo yum -y install ntp [cos@localhost scripts]$ sudo chkconfig ntpd onNote: Forwarding request to 'systemctl enable ntpd.service'.ln -s '/usr/lib/systemd/system/ntpd.service' '/etc/systemd/system/multi-user.target.wants/ntpd.service'[cos@localhost scripts]$ sudo ntpdate time.apple.com12 May 07:52:16 ntpdate[28563]: step time server 17.253.84.253 offset 22477005.642802 sec

然后再运行克隆命令就可以了：

[cos@localhost github]$ git clone --recurse-submodules https://github.com/tensorflow/tensorflowCloning into 'tensorflow'...remote: Counting objects: 42594, done.Receiving objects:   2% (1000/42594), 260.01 KiB

其实github也可以配置成通过SSH访问，我最近一直用的bitbucket就是配置成SSH协议。首先生成Key：

[cos@localhost nlp]$ ssh-keygen -t rsa -b 4096Generating public/private rsa key pair.Enter file in which to save the key (/home/cos/.ssh/id_rsa):Created directory '/home/cos/.ssh'.Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /home/cos/.ssh/id_rsa.Your public key has been saved in /home/cos/.ssh/id_rsa.pub.The key fingerprint is:...cos@localhost.localdomainThe key's randomart image is:...

然后要在github网站账户设置里添加公共密匙，就是刚生成的 ~/.ssh/id_rsa.pub文件内容

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