centos 下安装 Let’s Encrypt 永久免费 SSL 证书

功能

1. https证书，免费版，每三个月续签一次，可以用过脚本自动续签

安装

1. ssh登录到域名配置所在的主机（nginx，apache等）
2. 安装git yum -y install git
3. 输入 git clone https://github.com/letsencrypt/letsencrypt
4. cd letsencrypt
5. chmod +x letsencrypt-auto

6. 安装证书:

   • ./letsencrypt-auto certonly --email [email protected] -d jenkins.jetbrains.org.cn
   • d参数后面对应的是域名，在执行的过程中，我遭遇了下面的报错：
     `Total size: 44 M

Downloading Packages:
Running rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
libgdbm.so.2()(64bit) is needed by python-libs-2.6.6-66.el6_8.x86_64
** Found 7 pre-existing rpmdb problem(s), 'yum check' output follows:
4:perl-5.10.1-141.el6_7.1.x86_64 has missing requires of libgdbm.so.2()(64bit)
4:perl-devel-5.10.1-141.el6_7.1.x86_64 has missing requires of gdbm-devel
polkit-0.96-5.el6_4.x86_64 has missing requires of libeggdbus-1.so.0()(64bit)
2:postfix-2.6.6-6.el6_5.x86_64 has missing requires of libmysqlclient.so.16()(64bit)
2:postfix-2.6.6-6.el6_5.x86_64 has missing requires of libmysqlclient.so.     16(libmysqlclient_16)(64bit)
2:postfix-2.6.6-6.el6_5.x86_64 has missing requires of mysql-libs
python-libs-2.6.6-52.el6.x86_64 has missing requires of libgdbm.so.2()(64bit)
Your transaction was saved, rerun it with: yum load-transactiontmp/.yum_save_tx-2017-04-07-22-1798AqLE.yumtx
Could not install OS dependencies. Aborting bootstrap!`
* centos 6 需要安装 libgdbm.so.2：
    * `wget http://mirror.centos.org/centos/6/os/x86_64/Packages/gdbm-1.8.0-39.el6.x86_64.rpm`
   * `yum localinstall gdbm-1.8.0-39.el6.x86_64.rpm`

* 完成后，重新执行上面的命令行：

1. 即为安装完成

配置

1. web服务器，为这里是nginx，在nginx中添加代码：

        listen 443 ssl;
        ssl on;
        ssl_certificate /etc/letsencrypt/live/XXX.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/XXX.com/privkey.pem;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; 
2. 重启nginx，就可以放了https了

续约

1. linux中执行 crontab -e
2. 添加代码
 
   `06 06 * * * /www/web/test/lets/certbot-master/certbot-auto renew   --force-renewal   --pre-hook "/etc/init.d/nginx stop" --post-hook "/etc/init.d/nginx start" >> /www/web_logs/letsencry.log 2>&1`

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