标签:在线安装 rds chroot Opens facility das bsp obsolete interval
1、firewalld的基本使用
1、iptables的基本使用
SSH的英文全称是Secure SHell。通过使用SSH,你可以把所有传输的数据进行加密,这样“中间人”这种攻击方式就不可能实现了,而且也能够防止DNS和IP欺骗。还有一个额外的好处就是传输的数据是经过压缩的,所以可以加快传输的速度。SSH有很多功能,它既可以代替telnet,又可以为ftp、pop、甚至ppp提供一个安全的“通道”。
SSH在Linux中的服务是sshd,安装openssh后才可开启。CentOS 7 安装后默认情况下是不启动sshd服务,即无法通过ssh服务远程连接。
首先查看系统是否安装openssh,一般情况想都是默认安装了,
[root@localhost ~]# rpm -qa | grep ssh
libssh2-1.4.3-10.el7.x86_64
openssh-server-6.6.1p1-22.el7.x86_64
openssh-clients-6.6.1p1-22.el7.x86_64
openssh-6.6.1p1-22.el7.x86_64
如果没有安装可以通过yum在线安装。
[root@localhost ~]# yum install openssh
1、先检查确认有没有安装ssh-server服务器,输入命令:ps –e|grep ssh
2、在CentOS命令区输入:yum install openssh-server
3、启动、关闭、重启命令:
开启ssh服务:service sshd start
关闭ssh服务:service sshd stop
重启ssh服务:servcie sshd restart
4、开机自启动相关设置:
SSH服务开机自动启动:chkconfigsshd on
取消开机自启动:chkconfig sshd off
开启服务后,检查服务状态:service sshd status
[root@localhost ~]# vi /etc/ssh/sshd_config
# $OpenBSD: sshd_config,v 1.93 2014/01/10 05:59:19 djm 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 22 #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 HostKey /etc/ssh/ssh_host_ed25519_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 #AuthorizedKeysCommandUser nobody # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don‘t trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # Don‘t read the user‘s ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # To disable tunneled clear text passwords, change to no here! #PasswordAuthentication yes #PermitEmptyPasswords no PasswordAuthentication yes # Change to no to disable s/key passwords #ChallengeResponseAuthentication yes ChallengeResponseAuthentication no # Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes #KerberosGetAFSToken no #KerberosUseKuserok yes # GSSAPI options GSSAPIAuthentication yes GSSAPICleanupCredentials no #GSSAPIStrictAcceptorCheck yes #GSSAPIKeyExchange no #GSSAPIEnablek5users no # Set this to ‘yes‘ to enable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication and # PasswordAuthentication. Depending on your PAM configuration, # PAM authentication via ChallengeResponseAuthentication may bypass # the setting of "PermitRootLogin without-password". # If you just want the PAM account and session checks to run without # PAM authentication, then enable this but set PasswordAuthentication # and ChallengeResponseAuthentication to ‘no‘. # WARNING: ‘UsePAM no‘ is not supported in Red Hat Enterprise Linux and may cause several # problems. UsePAM yes #AllowAgentForwarding yes #AllowTcpForwarding yes #GatewayPorts no X11Forwarding yes #X11DisplayOffset 10 #X11UseLocalhost yes #PermitTTY yes #PrintMotd yes #PrintLastLog yes #TCPKeepAlive yes #UseLogin no UsePrivilegeSeparation sandbox # Default for new installations. #PermitUserEnvironment no #Compression delayed #ClientAliveInterval 0 #ClientAliveCountMax 3 #ShowPatchLevel no #UseDNS yes #PidFile /var/run/sshd.pid #MaxStartups 10:30:100 #PermitTunnel no #ChrootDirectory none #VersionAddendum none # no default banner path #Banner none # Accept locale-related environment variables AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE AcceptEnv XMODIFIERS # override default of no subsystems Subsystem sftp /usr/libexec/openssh/sftp-server # Example of overriding settings on a per-user basis #Match User anoncvs # X11Forwarding no # AllowTcpForwarding no # PermitTTY no # ForceCommand cvs server
修改端口的时候需要添加到防火墙的控制中,否则无法使用ssh连接。
[root@localhost ~]# semanage port -l | grep ssh #查看当前ssh服务监听的端口
ssh_port_t tcp 22
[root@localhost ~]# semanage port -a -t ssh_port_t -p tcp 8090 #增加监听端口8090[root@localhost ~]# semanage port -l | grep ssh
ssh_port_t tcp 8090,22
semanage只是端口工具,修改防火墙只能使用firewall-cmd
[root@localhost ssh]# yum provides firewall-cmd #查找防火墙工具所在的包
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
- base: mirror.bit.edu.cn
- extras: mirrors.btte.net
- updates: mirrors.btte.net
firewalld-0.3.9-14.el7.noarch : A firewall daemon with D-BUS interface providing a dynamic firewall
Repo : base
Matched from:
Filename : /usr/bin/firewall-cmd[root@localhost ssh]# yum -y install firewalld #安装防火墙工具
[root@localhost ssh]# systemctl start firewalld #启动防火墙服务
[root@localhost ssh]# systemctl status firewalld #查看防火墙状态
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2016-09-17 04:22:15 CST; 15s ago
Main PID: 16979 (firewalld)
CGroup: /system.slice/firewalld.service
└─16979 /usr/bin/python -Es /usr/sbin/firewalld –nofork –nopid
Sep 17 04:22:14 localhost systemd[1]: Starting firewalld - dynamic firewall daemon…
Sep 17 04:22:15 localhost systemd[1]: Started firewalld - dynamic firewall daemon.
[root@localhost ssh]# firewall-cmd –zone=public –add-port=8090/tcp –permanent #防火墙中允许8090端口通过
success[root@localhost ssh]# semanage port -m -t ssh_port_t -p tcp 8090 #将ssh服务修改为8090端口
[root@localhost ssh]# firewall-cmd –zone=public –remove-port=22/tcp –permanent #删除22端口
success
[root@localhost ssh]# firewall-cmd –reload #重新加载防火墙服务配置
success
标签:在线安装 rds chroot Opens facility das bsp obsolete interval
原文地址:https://www.cnblogs.com/cainiao-chuanqi/p/12863057.html