Background saving terminated by signal 9

If Redis fails due to being killed:

It is typically caused by OOM. Log in the host and check the debug messages

Notice the "Memory cgroup out of memory", it could be inferred that the memory limit set for the Redis container is too low. Increasing the limit will solve the problem.

Overcoming output buffer limit

If Redis fails to initialize with log lines:

5101:M 20 Feb 18:14:29.130 # Client id=4500196 addr=71.459.815.760:43872 fd=533 name= age=127 idle=127 flags=S db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=13997 oll=1227 omem=192281275 events=rw cmd=psync scheduled to be closed ASAP for overcoming of output buffer limits.

This means that slave buffer is not enough and you should increase it (at master):

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