#CPU performance evaluation can find out whether there is a performance bottleneck in the CPU through the following commands, and then further check with the top, ps and other commands to locate those processes that cause excessive CPU load vmstat command: View CPU load[ blackfox@localhost ~]$vmstat 2 3 # Interval 2s, hit read the whole passage

Fstransform can convert ext2, ext3, ext4, jfs, reiserfs, or xfs partitions to another type in almost any combination. More importantly, it can be executed directly without formatting or copying data-- Few people at Atolstoy know that they can change the file system from one read the whole passage

1. ls [Options] [Directory Name | List all directories and files under the relevant directory - a List all files including hidden files starting with. a - A Pass - a, but not "." and ".." - l List file details - c Display by ctime - t Sort by file modification time - read the whole passage

Keepalived is a highly available WEB service solution based on VRRP protocol, which can be used to avoid a single point of failure. Use multiple nodes to install keepalived. Other nodes are used to provide real services. Similarly, they represent a virtual IP externally. When the primary server goes down, the backup server will take over the virtual IP and continue to provide services read the whole passage

Introduction awk is a powerful text analysis tool. compared with grep's search and sed's editing, awk is particularly powerful when it analyzes data and generates reports. In simple terms, awk reads the file line by line, slices each line with blank as the default separator, and then performs various analysis and processing on the cut part. There are three different versions of awk: awk, nawk read the whole passage