Can Linux be infected with viruses?

If you want to know the network connection on your current computer, you can view it through the command line tool; use netstat-ano on Windows to view all connections and PIDs, use ss-tulnp and lsof-i-P to obtain detailed information, and can also be monitored in real time through graphical interface tools such as resource monitor, nethogs, etc.

The locale setting problem affects the operation and display of the program. The solution is as follows: 1. Check the currently supported locale list using locale-a; 2. Generate missing locale, use sudodpkg-reconfigurelocales for Debian/Ubuntu, and use sudolocaledef command for RedHat/CentOS/Fedora; 3. Modify the /etc/default/locale file to set the default locale and reload; 4. SSH login warnings need to generate the corresponding locale on the server or adjust the local SSH configuration; 5. It is recommended to unify LANG and LC_CTYPE for abnormal characters in the graphical interface.

To monitor the usage of disk quota, you can use the quota command to view the quota quota, use repquota to view the overall usage, and use scripts to achieve automated monitoring. Specific steps: 1. Use quota-uusername to view the disk usage details of a specific user; 2. Use repquota/path/to/mountpoint to batch view all user quota usage; 3. Write shell scripts to combine repquota and email notification functions to achieve automatic monitoring, and set cron timed tasks to execute daily, so as to timely grasp and warn about the problem of overdue disk quota.

Unattended upgrades are suitable for managing multiple servers, wishing to reduce manual updates, or failing to maintain the system at any time. First install the unattended-upgrades package: sudoaptinstallunattended-upgrades, and then enable the default configuration: sudodpkg-reconfigure-plowunattended-upgrades. Select "Yes" in the interactive interface to enable it. Custom behavior can be achieved by modifying the configuration file /etc/apt/apt.conf.d/50unattended-upgrades, such as adding update sources and setting automatic restart (Unattended-Up

To create an LVM volume group, you must first prepare a physical volume (PV) and then create a VG. 1. Use pvcreate to initialize the hard disk or partition into PV, such as pvcreate/dev/sdb1; 2. Use the vgcreate command to combine one or more PVs into VG, such as vgcreatemy_volume_group/dev/sdb1/dev/sdc1; 3. You can customize the PE size through the -s parameter and use vgdisplay to view information; 4. You can dynamically expand VG in the future and add a new PV using vgextend; 5. Before deleting VG, you must confirm that there is no LV and delete it with vgremove.

The key to managing environment variables is to use .env files to centrally manage, distinguish different environment configurations, inject variables during deployment, and avoid hard-coded sensitive information. Specific practices include: 1. Use .env files to store variables and distinguish them by environment, such as .env.development and .env.production, and add .gitignore; 2. Use NODE_ENV and other identifiers to determine the corresponding configuration of the current environment to automatically load; 3. Inject variables at the system level when deploying servers, Docker or cloud platforms to improve security; 4. All sensitive information must be obtained from environment variables, the naming must be clear, and can be managed in combination with encryption means or special tools.

Efficiently managing AzureVM requires mastering three aspects: creation configuration, performance monitoring and cost optimization, and backup security management. First, select the right region and official support system image when creating, use independent VNet on the network, restrict open ports and enable NSG, and enable start-up diagnostics at the same time; secondly, use AzureMonitor to view resource utilization, set timed power on and off, automatic scaling, give priority to using reserved instances, and select disk types according to needs to save costs; finally, use Backup service regularly for backup, set the retention period to more than 30 days, and regularly update patches in terms of security, use the "Security Center" to scan vulnerabilities, avoid logging in with an administrator account and turning on disk encryption to ensure data security.

Linux monitoring involves a variety of tools, system performance monitoring tools include top/htop real-time viewing of resource usage, vmstat displays virtual memory status, iostat detects disk IO bottlenecks, and sar records historical performance data. The log monitoring tool includes journalctl filtering service logs, dmesg debugging kernel issues, logrotate management log life cycle, and rsyslog/syslog-ng centralized forwarding logs. In terms of network monitoring, SS/NNSTAT checks the connection status, NMap scans open ports, TCPDump captures traffic analysis, and iftop monitors bandwidth usage. Remote monitoring solutions such as Nagios implement deep custom alarms, Zab