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1.安装OpenSSH服务器软件包

用指令查询，已经全部安装。

编辑/etc/ssh/sshd_config文件：

#       $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj 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:/usr/local/sbin:/usr/sbin# 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 ::HostKey /etc/ssh/ssh_host_rsa_keyHostKey /etc/ssh/ssh_host_ecdsa_key#In FIPS mode Ed25519 keys are not supported, please comment out the next lineHostKey /etc/ssh/ssh_host_ed25519_key# Ciphers and keying#RekeyLimit default none# This system is following system-wide crypto policy. The changes to# crypto properties (Ciphers, MACs, ...) will not have any effect here.# They will be overridden by command-line options passed to the server# on command line.# Please, check manual pages for update-crypto-policies(8) and sshd_config(5).# Logging#SyslogFacility AUTHSyslogFacility AUTHPRIV#LogLevel INFO# Authentication:#LoginGraceTime 2mPermitRootLogin yes#StrictModes yes#MaxAuthTries 6#MaxSessions 10#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_keysAuthorizedKeysFile      .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#HostbasedAuthentication no# Change to yes if you don't trust ~/.ssh/known_hosts for# 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 noPasswordAuthentication yes# Change to no to disable s/key passwords#ChallengeResponseAuthentication yesChallengeResponseAuthentication no# Kerberos options#KerberosAuthentication no#KerberosOrLocalPasswd yes#KerberosTicketCleanup yes#KerberosGetAFSToken no#KerberosUseKuserok yes# GSSAPI optionsGSSAPIAuthentication yesGSSAPICleanupCredentials 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 RHEL and may cause several# problems.UsePAM yes#AllowAgentForwarding yes#AllowTcpForwarding yes#GatewayPorts noX11Forwarding yes#X11DisplayOffset 10#X11UseLocalhost yes#PermitTTY yes# It is recommended to use pam_motd in /etc/pam.d/sshd instead of PrintMotd,# as it is more configurable and versatile than the built-in version.PrintMotd no#PrintLastLog yes#TCPKeepAlive yes#PermitUserEnvironment no#Compression delayed#ClientAliveInterval 0#ClientAliveCountMax 3#UseDNS no#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 variablesAcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGESAcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENTAcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGEAcceptEnv XMODIFIERS# override default of no subsystemsSubsystem       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 serverPort 22ListenAddress 192.168.0.2PermitEmptyPasswords noDenyUsers lisi

出现问题：E325: ATTENTION Found a swap file by the name "/etc/ssh/.sshd_config.swp"