docker network create --subnet 172.20.0.0/16 --ip-range 172.20.240.0/20 zabbix-net

docker run --name postgres-server -t -e POSTGRES_USER="zabbix" -e POSTGRES_PASSWORD="zabbix_pwd" -e POSTGRES_DB="zabbix" --network=zabbix-net --restart unless-stopped -d postgres:latest

docker run --name zabbix-snmptraps -t -v /zbx_instance/snmptraps:/var/lib/zabbix/snmptraps:rw -v /var/lib/zabbix/mibs:/usr/share/snmp/mibs:ro --network=zabbix-net -p 162:1162/udp --restart unless-stopped -d zabbix/zabbix-snmptraps:alpine-5.4-latest

docker run --name zabbix-server-pgsql -t -e DB_SERVER_HOST="postgres-server" -e POSTGRES_USER="zabbix" -e POSTGRES_PASSWORD="zabbix_pwd" -e POSTGRES_DB="zabbix" -e ZBX_ENABLE_SNMP_TRAPS="true" --network=zabbix-net -p 10051:10051 --volumes-from zabbix-snmptraps --restart unless-stopped -d zabbix/zabbix-server-pgsql:alpine-5.4-latest

docker run --name zabbix-web-nginx-pgsql -t -e ZBX_SERVER_HOST="zabbix-server-pgsql" -e DB_SERVER_HOST="postgres-server" -e POSTGRES_USER="zabbix" -e POSTGRES_PASSWORD="zabbix_pwd" -e POSTGRES_DB="zabbix" --network=zabbix-net -p 443:8443 -p 8080:8080 -v /etc/ssl/nginx:/etc/ssl/nginx:ro --restart unless-stopped -d zabbix/zabbix-web-nginx-pgsql:alpine-5.4-latest

Reference: https://www.zabbix.com/documentation/current/en/manual/installation/containers

Step 1: Go to the /etc/yum.repos.d/ directory.

cd /etc/yum.repos.d/

Step 2: Run the below commands

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

Step 3: Now run the yum update

yum update -y

Step 4:

dnf install https://repo.zabbix.com/zabbix/6.0/rhel/8/x86_64/zabbix-agent-6.0.3-1.el8.x86_64.rpm

Edit /etc/zabbix/zabbix_agentd.conf

#Server=[zabbix server ip]
#Hostname=[ Hostname of client system ]

Server=192.168.1.100
ServerAlive=192.168.1.100
Hostname=Server1

systemctl enable zabbix-agent
systemctl start zabbix-agent

References:

https://techglimpse.com/failed-metadata-repo-appstream-centos-8/

https://tecadmin.net/install-zabbix-agent-centos-8/

iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

iptables -t nat -A PREROUTING -p tcp --dport 1111 -j DNAT --to-destination 2.2.2.2:1111
iptables -t nat -A POSTROUTING -d 2.2.2.2 -p tcp --dport 1111 -j MASQUERADE

Reference: https://superuser.com/questions/1011613/iptables-masquerade-only-selected-ports

docker start $(docker ps -a -q --filter "status=exited")

1. Install ssmtp :

   sudo apt-get install ssmtp
   

2. Edit the ssmtp config file:

   gksu gedit /etc/ssmtp/ssmtp.conf
   

3. Append the following text:

   root=username@gmail.com
   mailhub=smtp.gmail.com:465
   rewriteDomain=gmail.com
   AuthUser=username
   AuthPass=password
   FromLineOverride=YES
   UseTLS=YES
   

4. Run ssmtp and provide the recipient email address:

   ssmtp recepient_name@gmail.com
   

5. Provide the message details as follows:

   To: recipient_name@gmail.com
   From: username@gmail.com
   Subject: Sent from a terminal!
   
   Your content goes here. Lorem ipsum dolor sit amet, consectetur adipisicing.
   (Notice the blank space between the subject and the body.)
   
   

   ssmtp recipient_name@gmail.com < filename.txt
   

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@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 1852 -j DNAT --to-destination 192.168.0.61:1852
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j DNAT --to-destination 192.168.0.61:443
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 992 -j DNAT --to-destination 192.168.0.61:992
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 1194 -j DNAT --to-destination 192.168.0.61:1194
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 1852 -j DNAT --to-destination 192.168.0.61:1852
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 5555 -j DNAT --to-destination 192.168.0.61:5555
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 8888 -j DNAT --to-destination 192.168.0.61:8888
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 18106 -j DNAT --to-destination 192.168.0.61:18106
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 18158 -j DNAT --to-destination 192.168.0.61:18158
@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 18208 -j DNAT --to-destination 192.168.0.61:18208

@reboot sleep 61; /sbin/iptables -t nat -A PREROUTING -i eth0 -p udp --dport 1852 -j DNAT --to-destination 192.168.0.61:1852
@reboot sleep 65; /usr/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

#!/bin/bash
NOW=`date '+%H:%M:%S'`
MORNINGTIME="06:00:00"
NIGHTTIME="20:00:00"

if [ $NOW > $MORNINGTIME ] && [[ $NOW < $NIGHTTIME ]]
then
/sbin/route add -net 0.0.0.0/1 gw 192.168.168.1
/sbin/route add -net 128.0.0.0/1 gw 192.168.168.1
/sbin/route del -net 0.0.0.0/1 gw 192.168.42.1
/sbin/route del -net 128.0.0.0/1 gw 192.168.42.1
echo "Use 192.168.168.1"
else
/sbin/route del -net 0.0.0.0/1 gw 192.168.168.1
/sbin/route del -net 128.0.0.0/1 gw 192.168.168.1
/sbin/route add -net 0.0.0.0/1 gw 192.168.42.1
/sbin/route add -net 128.0.0.0/1 gw 192.168.42.1
echo "Use 192.168.42.1"
fi