需求描述
某次发现SSH登录服务器报错的事件记录 2021-05-18

user@server:~$ ssh -v root@10.6.8.56
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 10.6.8.56 [10.6.8.56] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/fd/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3


// 后审阅message日志,发现是系统内存不够了,重启就好了