During several months before every update system action I need to clean up /boot directory because it is full.
I had removed old kernels as described here (How to free up space on RHEL6 /boot safely?).
But every time after update – /boot is full again.
Today even after removing previous kernel is NOT enough space for yum update.
root@CentOS-70-64-minimal:/boot ============================================ [18:05:08]
> l
total 429M
dr-xr-xr-x. 5 root root 5.0K Jan 12 18:04 ./
drwxr-xr-x. 19 root root 4.0K Jan 12 03:16 ../
-rw-r--r--. 1 root root 121K Nov 3 20:18 config-3.10.0-229.20.1.el7.x86_64
drwxr-xr-x. 2 root root 1.0K Nov 1 23:50 grub/
drwxr-xr-x. 6 root root 1.0K Jan 12 18:04 grub2/
-rw-------. 1 root root 39M Nov 1 23:52 initramfs-0-rescue-36bcd6a9e7104f21b1fffdc70a2410ad.img
-rw-------. 1 root root 39M Jun 25 2015 initramfs-0-rescue-3f69b67d93ab47efad188530c7620ce7.img
-rw-------. 1 root root 36M Dec 6 2014 initramfs-0-rescue-5ada9d2ff7154b7d992458e573f12812.img
-rw-------. 1 root root 38M Mar 31 2015 initramfs-0-rescue-6cb1c41831054f7d8c5f96f86852974a.img
-rw-------. 1 root root 39M Aug 8 10:18 initramfs-0-rescue-6d4eff407451426bb985a283f8a50b73.img
-rw-r--r--. 1 root root 25M Jul 10 2014 initramfs-0-rescue-74f877a555c841639922c44507d67b89.img
-rw-------. 1 root root 39M May 13 2015 initramfs-0-rescue-9dcee4fd9cc94410990561ec753679d4.img
-rw-------. 1 root root 18M Nov 14 19:42 initramfs-0-rescue-c3547f9231df4524867357ebcfa979e8.img
-rw-------. 1 root root 36M Dec 16 2014 initramfs-0-rescue-cddab3440a1f487dad750c2d85b023a9.img
-rw-------. 1 root root 36M Feb 2 2015 initramfs-0-rescue-dcfb8dbba18442ce83382fe302f8e256.img
-rw-------. 1 root root 38M Nov 14 19:41 initramfs-3.10.0-229.20.1.el7.x86_64.img
-rw-------. 1 root root 0 Nov 15 03:16 initramfs-3.10.0-229.20.1.el7.x86_64kdump.img
-rw-r--r--. 1 root root 576K Mar 31 2015 initrd-plymouth.img
drwx------. 2 root root 12K Dec 6 2014 lost+found/
-rw-r--r--. 1 root root 235K Nov 3 20:21 symvers-3.10.0-229.20.1.el7.x86_64.gz
-rw-------. 1 root root 2.8M Nov 3 20:18 System.map-3.10.0-229.20.1.el7.x86_64
-rwxr-xr-x. 1 root root 4.8M Nov 1 23:52 vmlinuz-0-rescue-36bcd6a9e7104f21b1fffdc70a2410ad*
-rwxr-xr-x. 1 root root 4.8M Jun 25 2015 vmlinuz-0-rescue-3f69b67d93ab47efad188530c7620ce7*
-rwxr-xr-x. 1 root root 4.7M Dec 6 2014 vmlinuz-0-rescue-5ada9d2ff7154b7d992458e573f12812*
-rwxr-xr-x. 1 root root 4.8M Mar 31 2015 vmlinuz-0-rescue-6cb1c41831054f7d8c5f96f86852974a*
-rwxr-xr-x. 1 root root 4.8M Aug 8 10:18 vmlinuz-0-rescue-6d4eff407451426bb985a283f8a50b73*
-rwxr-xr-x. 1 root root 4.7M Jul 10 2014 vmlinuz-0-rescue-74f877a555c841639922c44507d67b89*
-rwxr-xr-x. 1 root root 4.8M May 13 2015 vmlinuz-0-rescue-9dcee4fd9cc94410990561ec753679d4*
-rwxr-xr-x. 1 root root 0 Nov 14 19:42 vmlinuz-0-rescue-c3547f9231df4524867357ebcfa979e8*
-rwxr-xr-x. 1 root root 4.7M Dec 16 2014 vmlinuz-0-rescue-cddab3440a1f487dad750c2d85b023a9*
-rwxr-xr-x. 1 root root 4.7M Feb 2 2015 vmlinuz-0-rescue-dcfb8dbba18442ce83382fe302f8e256*
-rwxr-xr-x. 1 root root 4.8M Nov 3 20:18 vmlinuz-3.10.0-229.20.1.el7.x86_64*
-rw-r--r--. 1 root root 171 Nov 3 20:18 .vmlinuz-3.10.0-229.20.1.el7.x86_64.hmac
root@CentOS-70-64-minimal:/boot ============================================ [18:05:11]
> df
Filesystem Size Used Avail Use% Mounted on
/dev/md2 1008G 96G 862G 10% /
devtmpfs 7.6G 0 7.6G 0% /dev
tmpfs 7.7G 0 7.7G 0% /dev/shm
tmpfs 7.7G 17M 7.6G 1% /run
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/md1 488M 439M 25M 95% /boot
/dev/md3 1.7T 1.7T 0 100% /home
Best Answer
If your machine boots correctly now, I'd move the rescue kernels out of /boot into your home directory (or any other place really) and reboot, make sure it works and then remove them and then rerun yum update. You shouldn't need that many rescue kernels or any if your machine boots correctly
Edit:
Now, the fun part is if it doesn't boot correctly after moving the rescue kernels. Boot it into a live environment and then move each rescue kernel back into place one by one until you find the one that is being used.