How to running cron job every 5 minutes,seconds,hours,days. How to running a script a specific interval using cronjob in linux.  To execute a cronjob every 5 minutes */5 * * * * /home/huupv/script.sh To execute a cronjob every 5 hours 0 */5 * * * /home/huupv/script.sh How to running a job every 5 seconds $ cat every-5-seconds.sh #!/bin/bash while true do  /home/huupv/script.sh  sleep 5 done $ nohup ./every-5-seconds.sh & To execute a cronjob every 5th weekday 0 0 * * 5 /home/huupv/script.sh or 0 0 * * Fri /home/huupv/script.sh 0=Sun 1=Mon 2=Tue 3=Wed 4=Thu 5=Fri 6=Sat

Introduction Handling undelivered emails effectively is vital for maintaining smooth communication within an organization. When emails are returned to the sender as undeliverable, it can cause confusion and disrupt workflows. Zimbra allows administrators to edit the "Undelivered Mail Returned to Sender" message, providing a more informative and customized response to the sender. In this article, we will guide you through the process of editing these undelivered mail messages in Zimbra to enhance your email system's efficiency and user experience. How to edit  The failure template is used when mail is returned to the sender, How to edit Undelivered Mail Returned to Sender. Links to below you maybe likes: zimbra custom spamassassin rules How to create auto Bcc for Recipient mails for Zimbra 8.6 How to add spam filters on zimbra 8.6 How to create auto Bcc for sender mails for Zimbra 8.6 list accounts that has not logged in for the last x days in zimbra The below command ...

Step 1: To active cbpolicyd on zimbra 8.6 $su - zimbra $zmprov ms `zmhostname` +zimbraServiceInstalled cbpolicyd +zimbraServiceEnabled cbpolicyd Step 2: To acctive cbpolicyd webui cd /opt/zimbra/httpd/htdocs/ && ln -s ../../cbpolicyd/share/webui vim /opt/zimbra/cbpolicyd/share/webui/includes/config.php To add " $DB_DSN="sqlite:/opt/zimbra/data/cbpolicyd/db/cbpolicyd.sqlitedb ";" in config.php file. The ouput: #$DB_DSN="mysql:host=localhost;dbname=cluebringer"; $DB_DSN="sqlite:/opt/zimbra/data/cbpolicyd/db/cbpolicyd.sqlitedb"; $DB_USER="root"; #$DB_PASS=""; $DB_TABLE_PREFIX=""; Step 3: To restart services su - zimbra -c "zmcontrol restart" su - zimbra -c "zmapachectl restart" Step 4: To access cbpolicyd webui. http://IP-OF-Zimbra:7780/webui/index.php

When you create multi server, and you want to deploy zimbra proxy in DMZ. To use zimbra proxy HA, then you use keepalived use VIP. Many other solution. Lab environment Server Mail Proxy 01 IP:  192.168.10.10 VIP:  192.168.30.30 DNS Name: proxy01.huuphan.com zimbra_server_hostname: mail.huuphan.com Server Mail Proxy 02 IP:  192.168.20.20 VIP:  192.168.30.30 DNS Name: proxy02.huuphan.com zimbra_server_hostname: mail.huuphan.com Step 1: To instal keepalived #yum update -y #yum install -y keepalived Step 2: To configure keepalived  To refer install and configure keepalived  Zimbra proxy01 Master Server global_defs {   notification_email {     admin@huuphan.com   }   notification_email_from vrrp_proxy01@huuphan.com     smtp_server mbx.huuphan.com # mbx.huuphan.com mailstore     smtp_connect_timeout 30 } vrrp_script chk_nginx_service {     script "killall -0 nginx" ...

How to ssh port forwarding ( ssh tunneling) in linux. For example, Client [localhost:10000] ---> Server 1 [port:1111]----->Server 2 [port:22] Server 1 ip address: 192.168.1.12 port: 1111 Server 2 ip address: 192.168.1.13 port: 22 From client, how to login ssh to Server2 via Server1. ssh -p 1111 -f huupv@192.168.1.12 -L 10000:root@192.168.1.13:22  -N ssh -p 10000 root@localhost From client, how to copy files to Server2? scp -r -P 10000 /path/to/file root@localhost:/path/to/folder

Script to prepare necessary package for install zimbra 8.6 #!/bin/bash #Author: Phan Van Huu #Blog: huuphan.com RED='\033[0;31m' BLUE='\033[0;34m' NC='\033[0m' #No color ############## Prepair for install Zimbra(OS: Centos 6).################# ifconfig | grep "inet addr" && route | grep default #echo -e "$BLUE ############## Prepair for Zimbra(OS: Centos 6).################# $NC" #echo -e "" echo -e "$BLUE 1.Input IP address for server. $NC" read IP1 #echo -e "" #echo -e "$BLUE 2.Input netmask for server. $NC" #read NETMASK1 #echo -e "" #echo -e "$BLUE 3.Input gateway for server. $NC" #read GATEWAY1 #echo -e "$BLUE Input interface (Ex: eth0) : $NC" #read INTERFACES1 #echo "" #echo -e "$BLUE 4.Input DNS2 (Ex: 8.8.4.4). $NC" #read DNS2 #echo -e "" echo -e "" echo -e "$BLUE 2.Input DNS1 (Ex: 8.8.8.8...

How to Setup Chroot SFTP in Linux, it's allow only SFTP, not SSH. I'm running commands as root account. Step 1: To create group groupadd sftpusers Step 2: To create user useradd -g sftpusers -d /home/huupv -s /sbin/nologin huupv passwd huupv Step 3: Setup sftp-server Subsystem in sshd_config  vim /etc/ssh/sshd_config The output as bellow #Subsystem       sftp    /usr/libexec/openssh/sftp-server Subsystem       sftp    internal-sftp Step 4: Specify Chroot Directory for a Group vim /etc/ssh/sshd_config Adding line as following Match Group sftpusers         ChrootDirectory /sftp/%u         ForceCommand internal-sftp Step 5: To create sftp Home Directory mkdir -p /sftp/huupv/home/huupv Step 6: To setup Appropriate Permission chown huupv:sftpusers /sftp/huupv/home/huupv service sshd restart Test chroot sftp To connect from client ssh to server. ssh huupv@172.16....

Introduction Managing email distribution lists efficiently is crucial for maintaining effective communication within an organization. Zimbra provides various features to help administrators control who can send messages to specific distribution lists, ensuring that only authorized users can use this function.  In this article, we will guide you through the process of restricting sending permissions to distribution lists in Zimbra , helping you maintain a streamlined and secure email system. How to Restrict Sending to Distribution list in zimbra mail. in my post, i'm use to zimbra 8.6 open source edit. Links to below you maybe likes: zimbra custom spamassassin rules How to create auto Bcc for Recipient mails for Zimbra 8.6 How to add spam filters on zimbra 8.6 How to create auto Bcc for sender mails for Zimbra 8.6 list accounts that has not logged in for the last x days in zimbra Step 1:  if you have not distribution list, you can create distribution list as bellow. $zmp...

How to Install and Configure Zimbra 8.6 Multi master ldap, my post install multi master ldap, the script for zimbra 8.6 multi-master ldap. Zimbra ldap01 Hostname: ldap01.huuphan.local ip address: 192.168.131.15 Zimbra ldap02 Hostname: ldap02.huuphan.local ip address: 192.168.131.16 you can how to install and configure zimbra multi server Enabling Multi-Master Replication on zimbra ldap01 #su zimbra $ cd /opt/zimbra/ $./libexec/zmldapenable-mmr -s 1 -m ldap://ldap02.huuphan.local:389/ $zmlocalconfig -e ldap_master_url="ldap://ldap01.huuphan.local:389 ldap://ldap02.huuphan.local:389" $zmlocalconfig -e ldap_url="ldap://ldap01.huuphan.local:389 ldap://ldap02.huuphan.local:389" Installing a secondary Master ldap02 server The first, Two ldap01 and ldap02 the same password. From ldap01 $zmlocalconfig -s | grep passw | grep ldap Let's go install ldap02. ./install.sh The ouput [root@ldap02 zcs]# ./install.sh Operations logged to /tmp/in...

Introduction Learn how to set up Keepalived for IP failover on CentOS and Red Hat. This step-by-step guide ensures high availability and network redundancy, keeping your critical services online during hardware or network failures. In the world of high availability and network redundancy, ensuring that your critical services remain operational despite hardware or network failures is paramount. Keepalived is a robust and versatile tool designed to provide IP failover solutions on Linux servers, particularly on CentOS and Red Hat distributions. This guide delves into the configuration and deployment of Keepalived for IP failover, ensuring that your services continue to run smoothly even in the face of unexpected downtimes. Whether you're an IT professional aiming to bolster your infrastructure or a systems administrator looking to implement a reliable failover mechanism, this tutorial offers step-by-step instructions to help you achieve high availability with Keepalived. Keepalived ...