[CentOS] How to boot into a different kernel

Mon Feb 6 13:37:00 UTC 2012
Jonathan Vomacka <juvix88 at gmail.com>

CentOS Community,

Is there a command to boot into a different version of the kernel? I 
believe this is setup via grub.conf but unsure. There are a few 
different kernels loaded into /boot but I want to see if there is a 
command to boot into a different kernel as a single instance or 
permanent if needed. Please advise

[root at titanium boot]# ls -ltr
total 62768
-rw-r--r--. 1 root root  2312369 Dec  6 15:35 
System.map-2.6.32-220.el6.x86_64
-rw-r--r--. 1 root root   100943 Dec  6 15:35 config-2.6.32-220.el6.x86_64
-rwxr-xr-x. 1 root root  3938288 Dec  6 15:35 vmlinuz-2.6.32-220.el6.x86_64
-rw-r--r--. 1 root root   171087 Dec  6 15:36 
symvers-2.6.32-220.el6.x86_64.gz
-rw-r--r--. 1 root root  2313220 Dec 23 04:14 
System.map-2.6.32-220.2.1.el6.x86_64
-rw-r--r--. 1 root root   100947 Dec 23 04:14 
config-2.6.32-220.2.1.el6.x86_64
-rwxr-xr-x. 1 root root  3940752 Dec 23 04:14 
vmlinuz-2.6.32-220.2.1.el6.x86_64
-rw-r--r--. 1 root root   171175 Dec 23 04:17 
symvers-2.6.32-220.2.1.el6.x86_64.gz
drwx------. 2 root root    12288 Jan 18 10:36 lost+found
drwxr-xr-x. 3 root root     1024 Jan 18 10:45 efi
-rw-r--r--. 1 root root 14888469 Jan 18 10:45 
initramfs-2.6.32-220.el6.x86_64.img
-rw-r--r--. 1 root root 14885287 Jan 18 11:23 
initramfs-2.6.32-220.2.1.el6.x86_64.img
-rwxr-xr-x. 1 root root  3940016 Jan 23 22:02 
vmlinuz-2.6.32-220.4.1.el6.x86_64
-rw-r--r--. 1 root root  2313117 Jan 23 22:02 
System.map-2.6.32-220.4.1.el6.x86_64
-rw-r--r--. 1 root root   100947 Jan 23 22:02 
config-2.6.32-220.4.1.el6.x86_64
-rw-r--r--. 1 root root   171175 Jan 23 22:02 
symvers-2.6.32-220.4.1.el6.x86_64.gz
-rw-r--r--. 1 root root 14885301 Jan 26 08:13 
initramfs-2.6.32-220.4.1.el6.x86_64.img
drwxr-xr-x. 2 root root     1024 Feb  6 01:06 grub
[root at titanium boot]#