To check if Cpanel/WHM server need reboot from command line, run
whmapi1 system_needs_reboot
Example
On a server with latest kernal
[root@ns522466 ~]# whmapi1 system_needs_reboot --- data: details: {} needs_reboot: 0 metadata: command: system_needs_reboot reason: OK result: 1 version: 1 [root@ns522466 ~]#
On a server that need reboot
[root@server22 ~]# whmapi1 system_needs_reboot --- data: details: kernel: boot_version: 3.10.0-962.3.2.lve1.5.42.el7.x86_64 running_version: 3.10.0-962.3.2.lve1.5.39.el7.x86_64 updates: glibc: 2.17-323.el7_9 linux-firmware: 20200421-80.git78c0348.el7_9 openssl-libs: 1:1.0.2k-21.el7_9 needs_reboot: 1 metadata: command: system_needs_reboot reason: OK result: 1 version: 1 [root@server22 ~]#