centos 7.0 修改ssh默认连接22端口 和 添加防火墙firewalld 通过端口

首先 先做的就是 修改ssh的默认端口22

需要修改文件

/etc/ssh/sshd_config

使用命令

vi /etc/ssh/sshd_config

[root@localhost ~]# vi /etc/ssh/sshd_config
#       $OpenBSD: sshd_config,v 1.90 2013/05/16 04:09:14 dtucker Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/bin:/usr/bin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

# If you want to change the port on a SELinux system, you have to tell
# SELinux about this change.
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER
#
Port 48489
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# The default requires explicit activation of protocol 1
#Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Ciphers and keying
#RekeyLimit default none

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
SyslogFacility AUTHPRIV
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile      .ssh/authorized_keys

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none

　　先做就完成了 端口的修改 然后就需要让防火墙通过这个端口

具体操作 就是 按 I 键，进入插入编辑，找到Port前面的#去掉 ，改成自己需要的端口号

centos 7 默认使用的 是 firewalld  所以先看看是否运行

firewall-cmd --state

然后看下 先做默认通过的端口都有哪些

查看端口 规则

firewall-cmd --permanent --list-port

刚才测试 添加了 端口 现在删除这个端口 参数--permanent 是永久配置 机子重启依然有效

删除端口

firewall-cmd --permanent --remove-port=48489/tcp

添加端口 到防火墙例外

firewall-cmd --permanent --zone=public --add-port=48489/tcp

然后通过putty ssh连接软件链接一下就好了~

firewalld 参考资料

http://blog.csdn.net/smstong/article/details/39317277