List the the connection status and sort to identify attack source #netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort –n #netstat -n | grep :80 |wc –l or check…
F.
Find the user having high Inode usage
We can find the inode usage (Number of files) owned by each user/directory, especially useful in VPS. Each VPS will have inode limits (the maximum number of files that can be created in that VPS) For example If the inode…
Z.
Zimbra Restrict user to send to local domain
This time, it’s about limiting email certain user on Zimbra to only send email to local domain on certain domain. Edit /opt/zimbra/conf/zmconfigd/smtpd_recipient_restrictions.cf and add below line after permit_sasl_authneticated check_sender_access lmdb:/opt/zimbra/postfix/conf/restricted_senders Edit /opt/zimbra/conf/zmconfigd.cf file and add line below at postfix groups…
R.
Redis Slave Replication Issue; State wait_bgsave
On our redis replication with sentinel using 3 nodes, we have issue with error below in slave each time the redis sync RDB files;==5550:S 16 Apr 2021 19:58:53.654 # I/O error trying to sync with MASTER: connection lost==Replication info shows==127.0.0.1:6379>…
R.
Replace Degraded Zfs Pool Disk (Raid 1 -up) Proxmox
In case you have a Proxmox hypervisor using zfs raid filesystem and want to replace the disk when disk already reach the wear-out(ssd), or uncorrectable value in smartctl is highly unacceptable or the disk already reach maximum capacity. You can…