Shell script practice-- DNS Master-Slave synchronization script example

DNS master-slave synchronization script instance PS: After the two servers are up, it is best to restart both services. The master server configuration #!/ bin/bash#DNS master-slave synchronization--master server rpm -q bindif [ $? -ne 0 ];then yum install bind -y systemctl start namedfi#Determine whether DNS service is installed read -p "Please enter the master server address: " zhurad-p "Please enter the slave server address: " aggread-p "Domain name (please include suffix):" yuquanju="/etc/named.conf"quyu="/etc/named.rfc1912.zones"[ ! -e $quanju.bak ] && cp $quanju $quanju.baksed -i -e "13s/127.0.0.1/$zhu/" -e '21s/localhost/any/' $quanju[ ! -e $quyu.bak ] && cp $quyu $quyu.bak#Backup global, zone profiles grep "$yu" $quyu &> /dev/nullwhile [ $? -ne 0 ];do sed -i "18azone \"$yu\" IN {\n type master\;\n file \"$yu.dns\"\;\n allow- transfer { $cong\; }\;\n}\;\n" $quyu peizhi="/var/named/$yu.dns"cp -p /var/named/named.localhost $peizhidone#Determine whether the domain name exists, if not add sed -i -e '2d' -e "1a@ IN SOA "$yu"\. admin\. "$yu"\. (" /var/named/$yu.dnssed -i '8d' /var/named/$yu.dnssed -i '$d' /var/named/$yu.dnssed -i -e "7a\ NS $yu. " -e "/A/s/127.0.0.1/$zhu/" /var/named/$yu.dns#modify the zone file while [ 1 -ge 0 ];doread -p " Please enter a custom pointer (e.g. www IN A 8.8.8.8)" zhen echo $zhen > /var/named/$yu.dns read -p " Continue adding (y/n)" aif [ $a != "y" ];then breakfidone#loop systemctl stop firewalld.servicesetenforce 0systemctl restart namedjieguo=`systemctl status named| grep "active" &>/dev/null`if [ $? -eq 0 ];then echo "service startup"else echo "startup failure"fi#determine whether the service can start normally sed -i -e '3d' -e "2anameserver $zhu" /etc/resolv.conf#used for self-test slave server configuration #!/ bin/bash#DNS master-slave synchronization--slave server rpm -q bindif [ $? -ne 0 ];then yum install bind -yfi#Determine whether DNS service is installed read -p "Please enter the primary server address: " zhurad-p "Please enter the secondary server address: " aggread-p "Domain name (please include suffix):" yuquanju="/etc/named.conf"quyu="/etc/named.rfc1912.zones"[ ! -e $quanju.bak ] && cp $quanju $quanju.baksed -i -e "13s/127.0.0.1/$cong/" -e '21s/localhost/any/' $quanju[ ! -e $quyu.bak ] && cp $quyu $quyu.bak#Backup global, zone profiles grep "$yu" $quyu &> /dev/nullwhile [ $? -ne 0 ];do sed -i "18azone \"$yu\" IN {\n type slave\;\n file \"slaves\/$yu.dns\"\;\n masters { $zhu\;}\;\n}\;\n" $quyudone#Determine whether the domain name exists, if not add systemctl restart namedsystemctl stop firewalld.servicesetenforce 0jieguo=`systemctl status named| grep "active" &>/dev/null`if [ $? -eq 0 ];then echo "service startup"else echo "startup failure"fi#determine whether the service can start normally