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Detect New NIC CentOS7   ls -l /sys/class/net/ interfaceid= cat /sys/class/net/$interfaceid/address make a file in /etc/sysconfig/network-scripts vim /etc/sysconfig/network-scripts/ifcfg-$interfaceid TYPE=Ethernet BOOTPROTO=none NAME= DEVICE= HWADDR=MACADDRESS ONBOOT=yes IPADDR= NETMASK= then interface up ifup …

Temporary storage directories such as /tmp, /var/tmp and /dev/shm provide storage space for malicious executables. Crackers and hackers store executables in /tmp. Malicious users can use temporary storage directories to …

This is called mounting a loopback device. 3 steps. Creating the file that can be mounted as a file system Assigning the file as a block device Mounting the block …

Hot Clone is the term used to describe to completely clone a Linux server using r-sync across the network. This is useful in situations which you would like to create a …

For Ubuntu 14.04 12.04 CentOS 5.x 6.x 7.x echo “net.ipv6.conf.all.disable_ipv6 = 1” >>/etc/sysctl.conf echo “net.ipv6.conf.default.disable_ipv6 = 1” >>/etc/sysctl.conf sudo sysctl -p cat /proc/sys/net/ipv6/conf/all/disable_ipv6 #

สำหรับทำให้ postfix ทำงานแค่ ipv4 เพื่อไม่ให้ gmail มีปัญหาเรื่อง ipv6 gmail-smtp-in.l.google.com said: 550-5.7.1 Our system has detected that this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 …