/var/log/boot.log — 记录系统启动时的日志信息，如果系统启动之后有什么异常可以查看该文件信息

[root@localhost ~]# cat /var/log/boot.log   # 要用cat查看不要用vim
@               Welcome to CentOS 
Starting udev: G                                           [  OK  ]
Setting hostname VM_215_87_centos:                         [  OK  ]
Setting up Logical Volume Management:   No volume groups found
                                                           [  OK  ]
Checking filesystems
/dev/vda1: clean, 114164/3276800 files, 1357072/13106944 blocks
                                                           [  OK  ]
Remounting root filesystem in read-write mode:             [  OK  ]
Mounting local filesystems:                                [  OK  ]
Enabling local filesystem quotas:                          [  OK  ]
Enabling /etc/fstab swaps:                                 [  OK  ]
Entering non-interactive startup
iptables: Applying firewall rules: WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
                                                           [  OK  ]
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
FATAL: Module off not found.
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Determining if ip address 10.105.215.87 is already in use for device eth0...
                                                           [  OK  ]
WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.
FATAL: Module off not found.
Starting portreserve:                                      [  OK  ]
Starting system logger:                                    [  OK  ]
Starting php-fpm  done
Starting sshd:                                             [  OK  ]
Starting MySQL.. SUCCESS! 
Starting nginx:                                            [  OK  ]
Starting crond:                                            [  OK  ]
Starting jexec servicesStarting Zabbix Agent:              [  OK  ]