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Posted on Edited on In Word count in article: 763 Reading time ≈ 1 mins.

升级ssh相关漏洞之前,确保还有其他方式登录到服务器。推荐安装telnet, 升级openssh之后关闭服务即可

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Posted on Edited on In Word count in article: 0 Reading time ≈ 1 mins.

Posted on Edited on In Word count in article: 953 Reading time ≈ 1 mins.

/etc/fstab文件包含众多文件系统的描述信息。文件中每一行为一个文件系统的描述，每行的选项之间通过tab分隔，#开头的行会被转换为注释，空白行会被忽略。/etc/fstab文件中的设备顺序很重要，因为fsck、mount和umount等命令会读取fstab文件中的次序来执行相关的操作。
下面我们来看看/etc/fstab文件中的内容以及其对应的含义。

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Posted on Edited on In Word count in article: 698 Reading time ≈ 1 mins.

Linux下的访问限制有很多, iptables, hosts.allow, hosts.deny 等等

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Posted on Edited on In Word count in article: 1.6k Reading time ≈ 1 mins. 
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

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