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ucasFL translating
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Install Security Patches or Updates Automatically on CentOS and RHEL
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============================================================
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One of the serious needs of a Linux system is to be kept up to date regularly with the latest security patches or updates available for the corresponding distribution.
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In a previous article, we’ve explained how to [configure automatic security update in Debian/Ubuntu][1], in this article we will explain how to set up your CentOS/RHEL 7/6 distribution to auto update essential security packages when needed.
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Other Linux distributions in the same families (Fedora or Scientific Linux) can be configured similarly.
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### Configure Automatic Security Updates on CentOS/RHEL Systems
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On CentOS/RHEL 7/6, you will need to install the following package:
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```
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# yum update -y && yum install yum-cron -y
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```
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#### Enable Automatic Security Updates on CentOS/RHEL 7
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Once the installation is complete, open /etc/yum/yum-cron.conf and locate these lines – you will have to make sure that the values matches those listed here:
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```
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update_cmd = security
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update_messages = yes
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download_updates = yes
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apply_updates = yes
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```
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The first line indicates that the unattended update command will be:
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```
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# yum --security upgrade
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```
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whereas the other lines enable notifications and automatic download and installation of security upgrades.
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The following lines are also required to indicate that notifications will be sent via email from root@localhost to the same account (again, you may choose another one if you want).
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```
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emit_via = email
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email_from = root@localhost
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email_to = root
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```
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#### Enable Automatic Security Updates on CentOS/RHEL 6
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By default, the cron is configured to download and install all updates immediately, but we can change this behavior in /etc/sysconfig/yum-cron configuration file by modifying these two parameters to `yes`.
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```
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# Don't install, just check (valid: yes|no)
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CHECK_ONLY=yes
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# Don't install, just check and download (valid: yes|no)
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# Implies CHECK_ONLY=yes (gotta check first to see what to download)
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DOWNLOAD_ONLY=yes
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```
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To enable email notification that about the security package updates, set the MAILTO parameter to a valid mail address.
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```
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# by default MAILTO is unset, so crond mails the output by itself
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# example: MAILTO=root
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MAILTO=admin@tecmint.com
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```
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Finally, start and enable the yum-cron service:
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```
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------------- On CentOS/RHEL 7 -------------
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systemctl start yum-cron
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systemctl enable yum-cron
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------------- On CentOS/RHEL 6 -------------
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# service yum-cron start
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# chkconfig --level 35 yum-cron on
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```
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Congrats! You have successfully set up unattended upgrades on CentOS/RHEL 7/6.
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##### Summary
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In this article we have discussed how to keep your server updated regularly with the latest security patches or updates. Additionally, you learned how to configure email notifications in order to keep yourself updated when new patches are applied.
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If you have any concerns about this article? Feel free to drop us a note using the comment form below. We look forward to hearing from you.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/auto-install-security-patches-updates-on-centos-rhel/
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作者：[Gabriel Cánepa][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/gacanepa/
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[1]:http://www.tecmint.com/auto-install-security-updates-on-debian-and-ubuntu/
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@ -0,0 +1,97 @@
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在 CentOS 和 RHEL 系统上安装或自动更新安全补丁
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============================================================
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在 Linux 系统上，其中一个最重要的需求就是保持定期更新最新的安全补丁，或者为相应的 Linux 版本更新可用的安全补丁。
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在之前的文章中，我们分享了[如何在 Debian/Ubuntu 上配置自动安全更新][1]，在这篇文章中，我们将分享如何在 CentOS/RHEL 7/6 版本中设置自动更新重要的安全补丁，当你需要这样做的时候。
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在相同家族的其他 Linux 版本（Fedora 或 Scientific Linux）中可以用类似的方法进行配置。
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### 在 CentOS/RHEL 系统上配置自动安全更新
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在 CentOS/RHEL 7/6 系统上，你需要安装下面的安装包：
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```
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# yum update -y && yum install yum-cron -y
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```
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#### 在 CentOS/RHEL 7 系统上启用自动安全更新
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安装完成以后，打开 /etc/yum/yum-cron.conf，然后找到下面这些行内容，你必须确保它们的值和下面展示的一样
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```
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update_cmd = security
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update_messages = yes
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download_updates = yes
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apply_updates = yes
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```
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第一行表明自动更新命令行应该像这样：
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```
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# yum --security upgrade
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```
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而其他的行保证能够通知并自动下载和安装安全升级。
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为了使来自 root@localhost 的通知能够通过邮件发送给相同的账户（再次说明，你可以选择其他账户，如果你想这样的话），下面这些行也是必须的。
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```
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emit_via = email
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email_from = root@localhost
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email_to = root
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```
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#### 在 CentOS/RHEL 6 上启用自动安全更新
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默认情况下， cron 被配置成立即下载和安装所有更新，但是我们可以通过在 /etc/sysconfig/yum-cron 配置文件中把下面两个参数改为 ‘yes’，从而改变这种行为。
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```
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# Don't install, just check (valid: yes|no)
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CHECK_ONLY=yes
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# Don't install, just check and download (valid: yes|no)
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# Implies CHECK_ONLY=yes (gotta check first to see what to download)
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DOWNLOAD_ONLY=yes
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```
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为了启用关于安装包更新的邮件通知，你需要把 MAILTO 参数设置为一个有效的邮件地址。
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```
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# by default MAILTO is unset, so crond mails the output by itself
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# example: MAILTO=root
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MAILTO=admin@tecmint.com
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```
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最后，打开并启用 yum-cron 设备：
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```
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------------- On CentOS/RHEL 7 -------------
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systemctl start yum-cron
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systemctl enable yum-cron
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------------- On CentOS/RHEL 6 -------------
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# service yum-cron start
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# chkconfig --level 35 yum-cron on
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```
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恭喜你，你已经成功的在 CentOS/RHEL 7/6 系统上设置了自动升级。
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##### 总结
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在这篇文章中，我们讨论了如何保持你的设备定期更新或升级最新的安全补丁。另外，为了保证当新的补丁被应用时你自己能够知道，你也学习了如何配置邮件通知。
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如果你有任何关于这篇文章的顾忌，请在下面的评论区留下你的问题。我们期待收到你的来信。
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--------------------------------------------------------------------------------
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||||
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||||
via: http://www.tecmint.com/auto-install-security-patches-updates-on-centos-rhel/
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||||
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||||
作者：[Gabriel Cánepa][a]
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译者：[ucasFL](https://github.com/ucasFL)
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||||
校对：[校对者ID](https://github.com/校对者ID)
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||||
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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||||
[a]:http://www.tecmint.com/author/gacanepa/
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[1]:http://www.tecmint.com/auto-install-security-updates-on-debian-and-ubuntu/
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||||
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