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I'm running RHEL 7.2 in Amazon Web Services and am trying to make my /tmp use an attached 10 GB volume /dev/xvdh. Data does not need to persist, but I have to have a bigger volume just for tmp, because of a customer requirement. Here's the entry in my fstab.

/dev/xvdh       /tmp    xfs     defaults,nofail 0  2

When I run sudo mount -a, I don't get any errors, and yet, when I reboot, I don't see this mounting when I run lsblk, as seen below.

NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda    202:0    0  10G  0 disk
├─xvda1 202:1    0   1M  0 part
└─xvda2 202:2    0  10G  0 part /
xvdb    202:16   0   8G  0 disk /grid/01
xvdc    202:32   0   8G  0 disk /grid/02
xvdd    202:48   0   8G  0 disk /grid/03
xvde    202:64   0   8G  0 disk /grid/04
xvdf    202:80   0   8G  0 disk /grid/05
xvdg    202:96   0  20G  0 disk /var/log
xvdh    202:112  0  10G  0 disk

Got any pointers? The drive definitely exists...

I was asked to add the output of mount, here it is:

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=484472k,nr_inodes=121118,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/xvda2 on / type xfs (rw,relatime,attr2,inode64,noquota)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=28,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
/dev/xvdb on /grid/01 type xfs (rw,relatime,attr2,inode64,noquota)
/dev/xvde on /grid/04 type xfs (rw,relatime,attr2,inode64,noquota)
/dev/xvdd on /grid/03 type xfs (rw,relatime,attr2,inode64,noquota)
/dev/xvdg on /var/log type xfs (rw,relatime,attr2,inode64,noquota)
/dev/xvdf on /grid/05 type xfs (rw,relatime,attr2,inode64,noquota)
/dev/xvdc on /grid/02 type xfs (rw,relatime,attr2,inode64,noquota)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=101548k,mode=700,uid=1000,gid=1000)

here's the output of df /tmp:

/dev/xvda2      10473452 1603440   8870012  16% /

Edit: Like Edison says...

Well, I found another way that won't work. Per this thread, I tried masking this file /usr/lib/systemd/system/tmp.mount, but my mapping for /tmp still wouldn't work on reboot. So then I tried renaming the file, also didn't work. I restored the file and removed the mask.

FoxDeploy
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2 Answers2

2

You might want to try using the UUID instead. As in changing the fstab to

UUID=xxxxxxxxxxxx /tmp xfs defaults,nofail 0 2

rubes114
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  • I tried and put in the correct UUID, but it's still not persisting through a reboot. Are there any special perms I need to apply to the volume? – FoxDeploy Jan 04 '16 at 21:47
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    I had quotes around my uuid before, when I removed them this worked! – FoxDeploy Jan 05 '16 at 21:18
1

I too had this issue on our AWS RHEL 7.3 server (Dec 2016).

I was also able to reproduce the issue in a non AWS VM (via VMware), but only after masking tmp.mount in systemd.

Here's how to check to ensure tmp.mount is now masked via systemd on RHEL 7.

To test it: 

# systemctl tmp.mount  Unknown operation 'tmp.mount'.

# systemctl unmask tmp.mount  Removed symlink
 /etc/systemd/system/tmp.mount.

# systemctl status tmp.mount  ● tmp.mount - /tmp    Loaded: loaded
 (/etc/fstab; disabled; vendor preset: disabled)    Active: inactive
 (dead) since Fri 2016-12-02 18:39:04 PST; 2min 47s ago


# systemctl enable tmp.mount  Created symlink from
 /etc/systemd/system/local-fs.target.wants/tmp.mount to 
 /usr/lib/systemd/system/tmp.mount.

# systemctl status tmp.mount  ● tmp.mount - /tmp    Loaded: loaded
 (/etc/fstab; enabled; vendor preset: disabled)
user47812
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