VPS CPU 飙升至 100 如何查找原因？

[livc]

上面所有运行的服务都挂了，ssh 也没反应，

OpenSSH_7.6p1, LibreSSL 2.6.2
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 45.77.79.240 port 22.
debug1: Connection established.
debug1: identity file /Users/zhao/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/zhao/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6

只能强制重启了，好多次这种情况，请问如何知道是什么原因呢？？以及如何避免？

[pagxir]

进控制台看看。

[livc]

@pagxir #1 
没用过控制台，完全没反应。。。