This article explains why users may encounter the "Minimum 60 GB of disk space is required in /var partition" error while performing the Contrail Healthbot setup and what they should do to ensure that the setup is successful.
CentOS VM is installed by using a 150GB HD but upon installing on Kubernetes, the user gets the following error during the Healthbot setup:
[root@localhost ~]# sudo healthbot setup
Setting new password for postgres db
Do you want to install on kubernetes? [y/N] y
Checking disk space
Minimum 60 GB of disk space is required in /var partition. Available: 30 GB
While checking the VM disk space, we see that /var, which is part of /dev/mapper/centos-root, has only 50G in total, which is insufficient for the Healthbot installation. The minimum disk space required for the Contrail Healthbot installation is 60G.
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 9.8G 0 9.8G 0% /dev
tmpfs 9.9G 0 9.9G 0% /dev/shm
tmpfs 9.9G 8.8M 9.8G 1% /run
tmpfs 9.9G 0 9.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 50G 6.6G 44G 14% /
/dev/sda1 1014M 210M 805M 21% /boot
/dev/mapper/centos-home 90G 33M 90G 1% /home
tmpfs 2.0G 0 2.0G 0% /run/user/0
Option 1: (Recommended) Re-installing the OS
Re-install the host Operating System. During the OS installation, manually adjust the disk partitions before starting the installation. See the OS Installation documentation for guidance.
Option 2: Re-allocating the home partition
If the OS installation has placed a large amount of data in the /home volume, this disk space can be reallocated. Note that this should be done ONLY on a system that was just installed.
Caution: The process to reallocate disk space will DESTROY all data in the /home/* partition so it is a good practice to back up data to /tmp and then restore it.
Note: The first two steps in the following process are to back up data to /tmp. (This can be done only if the used space in /home is less than the available disk space in /.)
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Confirm that the /home partition was created and has low usage.
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 9.8G 0 9.8G 0% /dev
tmpfs 9.9G 0 9.9G 0% /dev/shm
tmpfs 9.9G 8.8M 9.8G 1% /run
tmpfs 9.9G 0 9.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 50G 6.6G 44G 14% /
/dev/sda1 1014M 210M 805M 21% /boot
/dev/mapper/centos-home 90G 33M 90G 1% /home
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home centos -wi-ao---- <89.18g
root centos -wi-ao---- 50.00g
swap centos -wi-ao---- 9.81g
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Back up the contents of /home.
To follow this process, ensure that you have logged in to the system as the "root" user directly (not sudo).
If the data used in /home is small, back up the data (/tmp needs to have more disk space available than the used space in /home).
tar czf /tmp/home_backup.tgz /home
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To expand /root, unmount the home volume, DESTROY the home volume, and then apply the home volume disk space to the root volume.
[root@localhost ~]# umount -fl /dev/mapper/centos-home
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Remove the unmounted volume.
[root@localhost ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
Logical volume "home" successfully removed
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Re-check the logical volumes.
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 50.00g
swap centos -wi-ao---- 9.81g
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Extend the logical volume of root with the space created by unmounting/removing the centos-home volume.
[root@localhost ~]# lvextend -L+50G /dev/mapper/centos-root
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 100.00 GiB (25600 extents).
Logical volume centos/root successfully resized.
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Re-grow the centos-root volume.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 26214400
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Remove the /dev/mapper/centos-home line from file fstab so that the Linux OS will not look for that volume during the next boot.
[root@localhost ~]# vi /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Jul 21 09:13:31 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
/dev/mapper/centos-home / xfs defaults 0 0 <<<<< Delete this.
/dev/mapper/centos-swap swap swap defaults 0 0
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"/etc/fstab" 11L, 465C written
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Re-check the space for the root volume.
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 100.00g
swap centos -wi-ao---- 9.81g
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The disk space is now good enough for the Healthbot installation to proceed.
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 9.8G 0 9.8G 0% /dev
tmpfs 9.9G 0 9.9G 0% /dev/shm
tmpfs 9.9G 8.7M 9.8G 1% /run
tmpfs 9.9G 0 9.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 100G 6.6G 94G 7% / <<<<<<<<<<
/dev/sda1 1014M 210M 805M 21% /boot
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Re-create/restore /home data.
cd /
tar zxf /tmp/home_backup.tgz