Logs record the following information:
- Health check alarm
- Health check restoration
- Unavailable address pool information
- Address pool restoration
- Access policy exception
Health check alarm
When health check finds that the IP addresses in an address pool are abnormal, relevant information is logged. The logged information includes the exception time, abnormal IP addresses, and error code.
You can identify the cause based on the error code. Common error codes are:
Protocol | Status code | Description |
---|---|---|
HTTP | 610 | Time-out (connection time-out and SSL certificate exchange time-out); time-out period: 30 seconds |
HTTP | 613 | DNS resolution error |
HTTP | 615 | Content mismatch |
HTTP | 616 | Failed authentication |
HTTP | 611 | Failed detection due to other causes |
Ping | 550 | Network unavailable |
Ping | 610 | All sent packets receive no response in 2 seconds despite stable network condition. |
Ping | 613 | Failed IP address resolution based on the host file |
TCP | 550 | Failed to enable the socket. A typical cause is that the system sources have run out. |
TCP | 610 | Failed response reception (time-out or no response) |
TCP | 611 | Failed connection (time-out or rejected by the peer end) |
TCP | 615 | Content mismatch |
UDP | 550 | Failed to enable the socket. A typical cause is that the system sources have run out. |
UDP | 611 | Failed connection (failed resolution based on the host file) |
UDP | 610 | Failed sending or reception |
UDP | 615 | Content mismatch |
DNS | 610 | Failed DNS resolution |
DNS | 613 | DNS query communication error |
DNS | 615 | Content mismatch |
Health check restoration
When health check finds that the abnormal IP addresses in an address pool are restored, relevant information is logged. The logged information includes the restoration time and restored IP addresses.
Address pool unavailable
When the number of healthy IP addresses in an address pool is less than the value of Minimum Available Addresses, the address pool is set to Unavailable and relevant information is logged. The logged information includes the specific time, address pool name, and value of Minimum Available Addresses.
Address pool restoration
When the number of healthy IP addresses in an address pool is greater than or equal to the value of Minimum Available Addresses, the address pool is set to Available and relevant information is logged. The logged information includes the specific time, address pool name, and value of Minimum Available Addresses.
Access policy exception
When the default address pool corresponding to an access policy is unavailable, the system switches to the failover address pool and relevant information is logged. The logged information includes the specific time, access policy name, and switchover rule between the default address pool and failover address pool.