Redis Tried to reinstall redis - server not working anymore, need fast help.

hazehs · Aug 12, 2020

Please fill in any relevant information that applies to you:
CentOS Version: CentOS 7 64 BIt

Centmin Mod Version Installed:123.09beta01

Nginx Version Installed: 1.9.2

PHP Version Installed: 7.4.9

MariaDB MySQL Version Installed: 10.3

When was last time updated Centmin Mod code base ?
today
Persistent Config: Do you have any persistent config file options set in /etc/centminmod/custom_config.inc ? You can check via this command:
Code (Text):
cat /etc/centminmod/custom_config.inc
Post output in CODE tags.
Hello,

ive tried to reinstall redis. Done with yum history, yum undo 69.
after that i installed like its on github.
Code:
yum -y install redis --enablerepo=remi --disableplugin=priorities
sed -i 's|LimitNOFILE=.*|LimitNOFILE=262144|' /etc/systemd/system/redis.service.d/limit.conf
echo "d      /var/run/redis/         0755 redis redis" > /etc/tmpfiles.d/redis.conf
mkdir -p /var/run/redis
chown redis:redis /var/run/redis
chmod 755 /var/run/redis
systemctl daemon-reload
systemctl start redis
systemctl enable redis
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo "echo never > /sys/kernel/mm/transparent_hugepage/enabled" >> /etc/rc.local
sysctl -p
then i tried to restart the server, cant connect.
Going through Hosting VNC Console and try systemctl daemon reload following error:

I think there is a problem because the redis.conf but im not sure and dont want to destory more the server....
Before removing redis, ive installed it with the github installer also and create it with multi cache 2

Hope someone can help me.

eva2000 · Aug 12, 2020

manual instructions are outdated compared to redis installer on github at centminmod/centminmod-redis so /etc/tmpfiles.d/redis.conf is no longer used and other changes have been made - commit history at centminmod/centminmod-redis and outlined changes for redis 6.x at centminmod/centminmod-redis

also what's contents of /etc/fstab by posting output for this command
Code (Text):
cat /etc/fstab
for posting code or output from commands to keep the formatting, you might want to use CODE tags for code How to use forum BBCODE code tags

hazehs said: ↑

ive installed it with the github installer also and create it with multi cache 2
Click to expand...

centmin mod redis installer and redis-generator.sh are provided as is without support generally.

But if you created 2 separate standalone redis servers with ondisk persistence disabled via
Code (Text):
./redis-generator.sh multi-cache 2
to delete them just use delete command instead of totally removing redis server
Code (Text):
./redis-generator.sh delete 2
redis-generator.sh usage help as outlined at centminmod/centminmod-redis
Code (Text):
/redis-generator.sh

* Usage: where X equal postive integer for number of redis
servers to create with incrementing TCP redis ports
starting at STARTPORT=6479.
* prep - standalone prep command installs redis-cluster-tool
* prepupdate - standalone prep update command updates redis-cluster-tool
* multi X - no. of standalone redis instances to create
* multi-cache X - no. of standalone redis instances + disable ondisk persistence
* clusterprep X - no. of cluster enabled config instances
* clustermake 6 - to enable cluster mode + create cluster
* clustermake 9 - flag to enable cluster mode + create cluster
* replication X - create redis replication
* replication X 6579 - create replication with custom start port 6579
* replication-cache X - create redis replication + disable ondisk persistence
* replication-cache X 6579 - create replication with custom start port 6579
* delete X - no. of redis instances to delete
* delete X 6579 - no. of redis instances to delete + custom start port 6579

./redis-generator.sh prep
./redis-generator.sh prepupdate
./redis-generator.sh multi X
./redis-generator.sh multi-cache X
./redis-generator.sh clusterprep X
./redis-generator.sh clustermake 6
./redis-generator.sh clustermake 9
./redis-generator.sh replication X
./redis-generator.sh replication X 6579
./redis-generator.sh replication-cache X
./redis-generator.sh replication-cache X 6579
./redis-generator.sh delete X
./redis-generator.sh delete X 6579

hazehs · Aug 12, 2020

Thanks again for your fast response.
I cant copy and paste via web browser vnc. So i need to provide screenshots - im sorry.
Screenshot at 23:35:04.jpg

Deleted the 2 redis instances sucesfully deleted the symlinks. needed to reinstall via yum redis.
after deleted the 2 redis instances ive restarted the server. but still nothing seems to work.
i think its a problem by csf. nginx started sucessfully when i type "systemctl status nginx".

error from csf:
https://imgur.com/HrJdyOB

hazehs · Aug 12, 2020

Okay, so my site is working now again. But csf is not starting.

Do i need to reinstall csf ?

eva2000 · Aug 12, 2020

hazehs said: ↑

Okay, so my site is working now again. But csf is not starting.

Do i need to reinstall csf ?
Click to expand...

no don't reinstall csf

need to figure out why csf isn't restarting - please don't use a reinstall as a way of fixing issues, as you can end up messing it up further. i.e. redis issues !

hazehs said: ↑

Thanks again for your fast response.
I cant copy and paste via web browser vnc. So i need to provide screenshots - im sorry.
Screenshot at 23:35:04.jpg

Deleted the 2 redis instances sucesfully deleted the symlinks. needed to reinstall via yum redis.
after deleted the 2 redis instances ive restarted the server. but still nothing seems to work.
i think its a problem by csf. nginx started sucessfully when i type "systemctl status nginx".

error from csf:
Screenshot at 23:43:16.jpg
Click to expand...

the output for
Code (Text):
cat /etc/fstab
is exactly same as screenshot or are you missing some lines in screenshot ?

for redis restart issue probably causing server reboot issue too in that /etc/tmpfiles.d/redis.conf is no longer required
Code (Text):
rm -f /etc/tmpfiles.d/redis.conf
systemctl daemon-reload
systemctl start redis
systemctl enable redis
csf error suggests to remove the file at /etc/csf/csf.error right ? so try removing it and restarting csf firewall
Code (Text):
rm -f /etc/csf/csf.error
csf -ra

hazehs · Aug 12, 2020

Hello,
ive rebooted the server and can connect via ssh, dont know why.
it is exactly as the screenshot:
Code:
#
# /etc/fstab
# Created by anaconda on Wed Jul 29 22:26:44 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg-root     /                       ext4    discard,noatime 1 1
UUID=39c57fb2-5222-4b9d-86ae-01666ae387e7 /boot                   ext2    defaults        1 2
/dev/mapper/vg-tmp      /tmp                    ext4    discard,noatime 1 2
/dev/mapper/vg-swap     swap                    swap    defaults        0 0
/home/usertmp_donotdelete /tmp ext4 loop,rw,noexec,nosuid 0 0
Ive disabled IPv6 via Grub because there come some errors in xenforo. since i removed ipv6 completely there no errors anymore. so because there where some errors cause ipv6 i have disabled it to in csf.

I also stop working with redis right now. Ive got to many problems with it and the configuration.

Thank you!
Ive tried csf -r but that not worked.
csf -ra is working great!

Im go reboot now the server and watch the console via vnc if there is still the fstab error.

hazehs · Aug 12, 2020

So, at booting there is the error with duplicate entry in fstab.
But i can only see this if im watching the console via vnc. So i dont know if this error was before.

After rbooting all services are running but i got 522 error from cloudflare.

eva2000 · Aug 12, 2020

hazehs said: ↑

So, at booting there is the error with duplicate entry in fstab.
Click to expand...

is this the first time after installing Centmin Mod that you rebooted the server ? it maybe due to your /etc/fstab entry for
Code (Text):
/dev/mapper/vg-tmp      /tmp                    ext4    discard,noatime 1 2
try putting a comment in front of it
Code (Text):
#/dev/mapper/vg-tmp      /tmp                    ext4    discard,noatime 1 2
to disable it and then reboot server

hazehs · Aug 12, 2020

I just backuped my DB and FTP and gonna reinstall the complete system.

i dont want a broken install or something else.
But thanks for your help.

No it wasnt the first time. i have rebooted the server severeal times.
I go directly after centminmod install rebooting the system and then configure the vhost.

eva2000 · Aug 12, 2020

Ok I see but try the commented out /etc/fstab entry i suggested and do reboot just to confirm if that is the issue so you don't replicate the issue on reinstall

hazehs · Aug 12, 2020

hey @eva2000 ,

after reinstalling and using redis with another config.php, updated the kernel from 3.1 to 5.8, disabling ipv6 completly, and dont using auditd the page seems to be 5 times faster.
dont know why. maybe it is because the kernel. got an 2gb ram and 2 core kvm.

regards.

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