Check the environment

This topic describes how to check the resources, ports, software versions, and time of a host.

Check host resources

Check whether the host resources meet the minimum requirements specified in Hardware requirements.

• Run the following command to check the number of CPU cores:

  cat /proc/cpuinfo | grep processor | wc -l;
  

• Run the following command to check the memory size:

  free -g;
  

• Run the following command to check whether the operating system of each host meets the requirements specified in Operating system requirements:

  uname -a;
  

Check ports

Run the telnet, nc, or netstat command to check whether a listening port is occupied by other processes. For more information, see Component listening port list.

# Run the telnet command to check the port. If the port is occupied, a '>' prompt is displayed. If the port is available, the following message is returned: telnet: connect to address xxx.xxx.xxx.1: Connection refused
telnet xxx.xxx.xxx.1 $PORT

# Run the nc command to check the port. If the port is occupied, 0 is returned. If the port is available, a value other than 0 is returned.
echo hi | nc xxx.xxx.xxx.1 $PORT -w 2 > /dev/null 2>&1
echo $?

# Run the netstat command to check the port.
sudo netstat -anp | grep -w $PORT

Check software versions

Run the package management command in the operating system of each host to check whether the software packages meet the requirements specified in Software requirements.

Check host time

• If you have configured the NTP service, you can run the ntpstat command to check the host time.

• If the NTP service is unavailable, run the date command to check the host time and compare the time difference between hosts.