linux启动信息排查

systemd-analyze

  time                    Print time spent in the kernel
  blame                   Print list of running units ordered by time to init
  critical-chain          Print a tree of the time critical chain of units
  plot                    Output SVG graphic showing service initialization
  dot                     Output dependency graph in dot(1) format
  set-log-level LEVEL     Set logging threshold for systemd
  dump                    Output state serialization of service manager
  verify FILE...          Check unit files for correctness

启动时间排序

systemd-analyze blame

级联顺序

systemd-analyze critical-chain

查看系统日志

journalctl -n 100

SVG图
systemd-analyze plot