Redis user permissions (ACL) and python connection

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 Recently, I was working on setting up a redis cluster along with separate users for readwrite and readonly. I setup the readonly user using the below privileges (ACLs):   user redisreadonly on >mySuperSecretPassword ~* resetchannels -@all +@read +ping +asking   Once this is setup, I wrote a simple program in python to connect to the redis cluster using the readonly credentials and print the number of keys.   #!/usr/bin/env python3 """ pip3 install redis """ from redis.cluster import RedisCluster, ClusterNode # ─────── Cluster connection ─────── startup_nodes = [ ClusterNode("redis_host_1", 6379), ClusterNode("redis_host_2", 6379), ClusterNode("redis_host_3", 6379) ] rc = RedisCluster(startup_nodes=startup_nodes,decode_responses=True,username='redisreadonly',password='mySuperSecretPassw...
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Shell script to monitor processes

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Many a time, one is faced with a situation where one needs to monitor a process to its completion. For example, if one is performing a clone, one has to copy the source files to the target or if one is performing a backup of any instance, the cp or tar commands that one has fired has to be monitored to its completion.

I generally use a customised script (as below) during those situations to monitor the processes.


while true
do
ps -fu <owner_of_the_process> grep <cp or rman or process_id> wc -l
printf "\n\nPress Ctrl+C to exit this loop.......\n\n"
sleep <the_number_of_seconds_this_process_should_sleep>
done

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