Question

What's the purpose of these directives inside redis unit file? Are they needed?

I am asking because in this redis tutorial link the author does not mention these.

[install]
ExecStartPre=-/bin/run-parts --verbose /etc/redis/redis-server.pre-up.d
ExecStartPost=-/bin/run-parts --verbose /etc/redis/redis-server.post-up.d
ExecStop=-/bin/run-parts --verbose /etc/redis/redis-server.pre-down.d
ExecStop=/bin/kill -s TERM $MAINPID
ExecStopPost=-/bin/run-parts --verbose /etc/redis/redis-server.post-down.d

PrivateTmp=yes
PrivateDevices=yes
ProtectHome=yes
ReadOnlyDirectories=/
ReadWriteDirectories=-/var/lib/redis
ReadWriteDirectories=-/var/log/redis
ReadWriteDirectories=-/var/run/redis
CapabilityBoundingSet=~CAP_SYS_PTRACE

# redis-server writes its own config file when in cluster mode so we allow
# writing there (NB. ProtectSystem=true over ProtectSystem=full)
ProtectSystem=true
ReadWriteDirectories=-/etc/redis

Also: In unit description, can we write whatever word we want or must be some directive.

[Unit]
Description=Advanced key-value store

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Your systemd service seems more comprehensive compared to the one you’ve linked. It’s a good thing. Generally, the more elaborate your service file the more stable the service is going to be. Not always but generally speaking.

So to answer your question, they’re not absolutely necessary but you’re better off with them than without. You’re also free to describe your Unit however you want. It’s free form and isn’t a directive.

Yes, they are not necessary.