Andy Kurth created VCL-836:
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Summary: cluster_info file may contain incorrect IP addresses
Key: VCL-836
URL: https://issues.apache.org/jira/browse/VCL-836
Project: VCL
Issue Type: Bug
Components: vcld (backend)
Affects Versions: 2.4
Reporter: Andy Kurth
Assignee: Andy Kurth
Fix For: 2.4.1
The cluster_info file added to computers in a cluster reservation may contain
wrong public IP addresses. This is due to the backend vcld daemon caching
reservation data including the computer public IP address in its %ENV variable.
A computer using dynamic DHCP may obtain a different IP address when loaded.
The IP address in the VCL database prior to the computer being loaded is
retrieved when the load (new or reload state) process begins. After the
computer is loaded, its correct public IP address is retrieved from the
computer's OS and the database is updated.
The problem occurs when subsequent processes are forked -- mainly when a
request goes from new to reserved. After the new process terminates, the vcld
daemon is still storing the original computer information in %ENV. A reserved
process is forked which uses this data. During reserved, cluster_info is
created which contains the public IP address of each computer assigned to the
request. When cluster_info is created, the previously retrieved data is used.
As a result, the only IP addresses which would be correct are the ones which
haven't changed since vcld originally retrieved the data.
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