Got this error today when trying to log into a docker container
$ docker exec -it mysql /bin/bash
failed to create runc console socket: mkdir /tmp/pty064803763: no space left on device: unknown
Then I tried
$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 4.0K 3.9G 1% /dev/shm
tmpfs 3.9G 378M 3.6G 10% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/rootvg-rootlv 7.8G 128M 7.3G 2% /
/dev/mapper/rootvg-usrlv 9.8G 2.3G 7.0G 25% /usr
/dev/sda1 976M 113M 797M 13% /boot
/dev/mapper/rootvg-optlv 2.0G 1.5G 303M 84% /opt
/dev/mapper/rootvg-homelv 976M 3.9M 905M 1% /home
/dev/mapper/rootvg-tmplv 2.0G 432M 1.4G 24% /tmp
/dev/mapper/rootvg-varlv 7.8G 4.2G 3.3G 56% /var
/dev/sdc 246G 1.1G 233G 1% /app
/dev/sdb1 16G 2.1G 13G 14% /mnt/resource
tmpfs 797M 0 797M 0% /run/user/48081
which did not indicate any problem. /tmp is only 24% used.
$ df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
devtmpfs 1016516 431 1016085 1% /dev
tmpfs 1019390 2 1019388 1% /dev/shm
tmpfs 1019390 856 1018534 1% /run
tmpfs 1019390 16 1019374 1% /sys/fs/cgroup
/dev/mapper/rootvg-rootlv 524288 6703 517585 2% /
/dev/mapper/rootvg-usrlv 655360 86575 568785 14% /usr
/dev/sda1 65536 343 65193 1% /boot
/dev/mapper/rootvg-optlv 131072 53934 77138 42% /opt
/dev/mapper/rootvg-homelv 65536 166 65370 1% /home
/dev/mapper/rootvg-tmplv 131072 131072 0 100% /tmp
/dev/mapper/rootvg-varlv 524288 26116 498172 5% /var
/dev/sdc 16384000 3649 16380351 1% /app
/dev/sdb1 1048576 13 1048563 1% /mnt/resource
tmpfs 1019390 1 1019389 1% /run/user/48081
Above is showing all the inodes have been exhausted under /tmp. On listing /tmp I saw lot of files like this
#-> cat /tmp/tmp.01amFL2hH4
read_kt /etc/krb5.keytab
write_kt /tmp/tmp.kt
For now I manually deleted the files. And after that it works
$ docker exec -it mysql /bin/bash
root@48b2dea3706b:/home#
siddharth's space 