Ssh
SSH 總是無法啟動且狀態為啟動
我在 Redhat 7.0 上執行 open-ssh 7.8p1。我下載了包並執行了命令以安裝包：
./configure –prefix=/usr –sysconfdir=/etc/ssh –with-privsep-path=/var/lib/sshd –with-pam –with-xauth=/usr/bin/xauth
製作
須藤使安裝
sshd/配置：
#AddressFamily any #ListenAddress 0.0.0.0 #ListenAddress :: 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 # Ciphers and keying #RekeyLimit default none # Logging #SyslogFacility AUTH SyslogFacility AUTHPRIV #LogLevel INFO # Authentication: #LoginGraceTime 2m #PermitRootLogin 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_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 #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 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 #PermitUserEnvironment no #Compression delayed ClientAliveInterval 20m #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 serverssh 調試模式結果：
debug2: load_server_config: done config len = 669 debug2: parse_server_config: config /etc/ssh/sshd_config len 669 debug3: /etc/ssh/sshd_config:22 setting HostKey /etc/ssh/ssh_host_rsa_key debug3: /etc/ssh/sshd_config:24 setting HostKey /etc/ssh/ssh_host_ecdsa_key debug3: /etc/ssh/sshd_config:25 setting HostKey /etc/ssh/ssh_host_ed25519_key debug3: /etc/ssh/sshd_config:32 setting SyslogFacility AUTHPRIV debug3: /etc/ssh/sshd_config:47 setting AuthorizedKeysFile .ssh/authorized_keys debug3: /etc/ssh/sshd_config:65 setting PasswordAuthentication yes debug3: /etc/ssh/sshd_config:69 setting ChallengeResponseAuthentication no debug3: /etc/ssh/sshd_config:96 setting UsePAM yes debug3: /etc/ssh/sshd_config:101 setting X11Forwarding yes debug3: /etc/ssh/sshd_config:112 setting ClientAliveInterval 20m debug3: /etc/ssh/sshd_config:126 setting AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES debug3: /etc/ssh/sshd_config:127 setting AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT debug3: /etc/ssh/sshd_config:128 setting AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE debug3: /etc/ssh/sshd_config:129 setting AcceptEnv XMODIFIERS debug3: /etc/ssh/sshd_config:132 setting Subsystem sftp /usr/libexec/openssh/sftp-server debug1: sshd version OpenSSH_7.8, OpenSSL 1.0.2k-fips 26 Jan 2017 debug1: private host key #0: ssh-rsa SHA256:Gd4H0gToGhergccDgoCrmH03UPAfWcUd1NKusBGlls4 debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:NxfjZIJ7oRPjfsBJKeSw/N3kf4iZMedZFnjePbLbyoc debug1: private host key #2: ssh-ed25519 SHA256:CWwG5eZVSaU3hSizraB1blaeYfws4KI6NOWn1I8KC9Y debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-ddd' debug3: oom_adjust_setup debug1: Set /proc/self/oom_score_adj from 0 to -1000 debug2: fd 3 setting O_NONBLOCK debug1: Bind to port 22 on 0.0.0.0. Server listening on 0.0.0.0 port 22. debug2: fd 4 setting O_NONBLOCK debug3: sock_set_v6only: set socket 4 IPV6_V6ONLY debug1: Bind to port 22 on ::. Server listening on :: port 22.我試圖找出問題所在，並嘗試在調試模式下執行 sshd，但它沒有顯示任何錯誤。1 分鐘後 sshd 服務失敗，然後它會自動重新啟動。
我能夠登錄到伺服器，但是當它失敗並且在重新啟動之前，我得到連接被拒絕。
所以如果有人可以建議這個問題的解決方案嗎？
我發現缺少什麼，使服務無法通過 systemd 啟動。ssh服務編譯成功但是在systemd中無法設置啟動。所以我從 http://www.linuxfromscratch.org/blfs/downloads/svn/blfs-systemd-units-20180105.tar.bz2下載了包，解壓了內容並執行了 sudo make install-sshd。
在此之後，我能夠通過 sudo systemctl start sshd.service 啟動服務，狀態為活動（正在執行）。