Out of disk space:

[root@ipservice fountain]# df -h
Filesystem                                                                                       Size  Used Avail Use% Mounted on
/dev/mapper/docker-8:3-6030754-44afc5875f379319fb0afa57bb0b90d864efd92d015e540451644daad8694970   99G   99G     0 100% /
tmpfs                                                                                             63G     0   63G   0% /dev
shm                                                                                               64M     0   64M   0% /dev/shm
tmpfs                                                                                             63G     0   63G   0% /sys/fs/cgroup
/dev/sda3                                                                                        197G  3.7G  184G   2% /etc/hosts
tmpfs                                                                                             63G  140M   63G   1% /run