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CAL (General)
dan.chen - 13:33 Tuesday 04 March 2025 (32886) Print this report
IP Address Modification of the CAL Test Server (cal-gst0)

With Oshino-san, Marco-san

Background

KAGRA’s LL data occasionally experiences missing values, which necessitates careful monitoring and troubleshooting. Additionally, data transfer tests using Kafka may be conducted on the test server in the future. As part of this preparation, connectivity tests between the test server (cal-gst0 = cal-gst2) and GitHub were performed.

Both the production server (cal-gst1) and the test server (cal-gst0) were previously configured to use a specified IP address from the DHCP-assigned address range. However, the specified address was the same for both servers, leading to an IP address conflict.

Changes Implemented

  • The configuration was modified so that cal-gst0 now dynamically obtains an IP address from DHCP instead of using a fixed assignment.
  • To ensure proper connectivity to GitHub, the temporary GitHub-related settings in /etc/hosts were commented out.

Verification

After making these changes, the following points were confirmed:

  • cal-gst0 successfully connects to GitHub.
  • cal-gst1 is able to access external networks.
  • LL data continues to be delivered to TMU (Tokyo Metropolitan University) as expected.

No changes were made to cal-gst1 in this process. These modifications resolve the previous IP address conflict.

Comments to this report:
takahiro.yamamoto - 19:49 Thursday 20 March 2025 (33049) Print this report
NIC settings on cal-gst2 was still incorrect and have been fixed.

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For future reference:
Changing 'ipv4.method' from 'manual' to 'auto' is not enough for switching static IP to dynamic IP. 'ipv4.addresses' and 'ipv4.gateway' must be also removed. Otherwise, NetworkManager assigns two static and dynamic IPs to one NIC. It appears to be configured well because it can be accessed using dynamic IP, but the problems of static IP being assigned and IP addresses conflitcting between cal-gst1 and cal-gst2 has not been corrected.
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