Toremoveapackageusingyum,usethecommandsudoyumremovepackage_name,whichremovesthepackageandpotentiallyitsunuseddependencies.Beforedoingso,ensureyouhavethecorrectpackagenamewithyumlistorrpm-q,checkdependenciesviayumdeplist,andavoidremovingcriticalsystem

To view the system log, you need to select the corresponding tool according to the operating system. Windows uses event viewer, with the path to Win R, enter eventvwr.msc, to view the "System" classification under "Windows Log", and supports filtering and saving; Linux system logs are usually located in /var/log/ directory, such as syslog, messages, dmesg files, and can be viewed by tail-f or journalctl-u service name commands; Mac can view logs through the Console application or logshow command. When viewing, you should pay attention to error and warning level information, analyze problems based on timestamps and context, and pay attention to permission requirements.

To create and use a network namespace, you need to create it first, then assign the interface and IP, and set up the routing to achieve communication. The steps are as follows: 1. Create a namespace with ipnetnsadd; 2. Create a vethpair through iplinkadd and move one end into the namespace; 3. Assign IP to the interface and enable it; 4. If you need external network access, enable IP forwarding, configure iptablesMASQUERADE and set default routes; 5. Close the interface first and clean the rules when deleting. The entire process needs to pay attention to resource cleaning and rule consistency.

When a file is occupied, you can search and end the occupied process by the following methods: 1. The Windows system can use the task manager to search for file handles with the resource monitor; 2. Use the handle.exe tool of Sysinternals to query accurately, requiring administrator permission; 3. Linux/macOS uses the lsof command to search for keywords, and grep can search for keywords; 4. Before ending the process, you must confirm the purpose. Windows can use the task manager or taskkill command, and Linux/macOS can use the kill command to avoid killing the system process by mistake.

To ensure that the system time synchronization is reliable, first make sure that the NTP service is installed and run, use systemctl to check the state of ntp or chronyd, and start and set up the power-on self-start if necessary. Secondly, configure a suitable NTP server, modify the /etc/ntp.conf or /etc/chrony/chrony.conf file, and recommend choosing a server with a similar geographical location such as Alibaba Cloud or Tencent Cloud. Finally, check the synchronization status and use ntpq-p or chronycsources to view the connection status. If the offset is too large, you can use ntpdate to manually calibrate it, but long-term synchronization should rely on background services to ensure stability.

The key to using parted partition disks is to master several steps: 1. Preparation: Confirm the target disk device name (such as /dev/sdb) and judge its partition table type. If it is less than 2TB, use MSDOS (MBR) and if it is greater than 2TB, use GPT; 2. Create a partition table: After entering parted operation mode, execute the mklabel command to select gpt or msdos, this step will clear the disk data; 3. Start partition: Use the mkpart command to specify the partition type, file system and start and end location, such as mkpartprimaryext40GB50GB, and continue to add other partitions; 4. Format and mount the partition: manually execute mkfs.ext4 and other commands to format,

Writing a simple Bash script is actually not that difficult. You can get started quickly by mastering a few basic structures and commands. 1. Each script should start with #!/bin/bash, and then run after adding execution permissions through chmod x; 2. The variables are assigned directly without declaration, and they are referenced by $ variable name or ${ variable name}, and use the read command to achieve input interaction; 3. The commonly used if judgment and for/while loops in the control process, pay attention to the difference between spaces before and after square brackets and comparison operators; 4. Practical techniques include debugging parameters - x, using absolute paths, adding comments to improve readability, and indicating successful ending by exit0. After mastering these core points, practice more to write Bash scripts proficiently.

When encountering a disk IO bottleneck, you should first confirm the root cause of the problem and then optimize it. 1. Use iostat, iotop and other tools to confirm whether there are IO bottlenecks, pay attention to %util and await indicators; 2. Analyze application behavior, reduce small files reading and writing, enable file system cache, and optimize log writing methods; 3. Select a suitable file system such as ext4 or XFS to improve IO efficiency; 4. Adjust the IO scheduling strategy, choose noop or deadline in SSD, and use CFQ in mechanical hard disks; 5. Use cache (such as Redis) and asynchronous IO mechanism to reduce disk pressure.