FreeMarker is a java-based template engine, commonly used to generate dynamic mvc architecture web pages.

Druid is a database connection pool component developed by Alibaba middleware team. It includes powerful connection pool monitoring features.

We first need to install a MariaDB 10.x database locally, and then access the database through MyBatis configuration.

Let’s use the spring initializer web features provided by the spring website to generate a super-simple hello world project.

rsyslogd is a system utility that provides support for message logging. Support for network and domain sockets enables this utility to support both local and remote logging.

yum is an interactive package manager based on rpm packages.

rpm is a tool that can be used to find, verify, install, update and delete applications.

Through the systemctl command, we can easily manage the systemd system and services.

anacron can execute commands or scripts periodically; this tool comes from the cronie package as well.

crontab is a tool for configuring scheduled tasks. It also maintains each user’s own crontab files.

Queue, check, or delete a job that needs to be scheduled for execution.

Displays statistics for virtual memory.

sar is a tool for collecting, reporting, or storing system activity information.

pmap and pstree can let us view the memory map f the process or show processes as a tree.

With the nice and renice commands, we can specify the priority of a program when it starts, or change the priority of a running process.

The kill command can terminate the process by the process ID or name, and the killall command can terminate the process itself and its associated processes by the process name.

A tool called iostat can be used to display CPU reports, it can also be used to display disk, partition input and output statistics reports.

We can monitor system resource usage through the glances tool, which also supports cross-platform monitoring.

We can use the dstat tool to generate statistics on system resource usage.

With commands such as bg fg jobs, we can do something about jobs in the background.