How to solve the "Failed opening the RDB file dump.rdb"?

Issue

• Meet the error "Failed opening the RDB file dump.rdb" in /var/log/redis/redis.log.

3582387:C 26 Sep 2023 17:14:37.379 # Failed opening the RDB file dump.rdb (in server root dir /var/lib/redis) for saving: Permission denied
3494770:M 26 Sep 2023 17:14:37.781 # Background saving error

• Meet the setroubleshoot report in /var/log/messages if setroubleshoot is enabled in the server.

Sep 26 17:06:08 localhost setroubleshoot[xxxxx]: SELinux is preventing /usr/bin/redis-server from search access on the directory /var/lib/redis.#012#012*****  Plugin restorecon (54.2 confidence) suggests   ************************#012#012If you want to fix the label. #012/var/lib/redis default label should be redis_var_lib_t.#012Then you can run restorecon. The access attempt may have been stopped due to insufficient permissions to access a parent directory in which case try to change the following command accordingly.#012Do#012# /sbin/restorecon -v /var/lib/redis#012#012*****  Plugin file (16.6 confidence) suggests   ******************************#012#012This is caused by a newly created file system.#012Then you need to add labels to it.#012Do#012/sbin/r
estorecon -R -v /var/lib/redis#012#012*****  Plugin file (16.6 confidence) suggests   ******************************#012#012If you think this is caused by a badly mislabeled machine.#

• Can't choose the single host item in grafana for PCP.