Disable cluster autodiscovery via multicast when clustering is disabled (as is
by default)
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Key: TS-775
URL: https://issues.apache.org/jira/browse/TS-775
Project: Traffic Server
Issue Type: Bug
Components: Clustering
Reporter: Igor Galić
By default clustering is disabled, however when a freshly installed instance
starts up, it tries to discover potential clustering partners via multicast
none the less. This is evident with Ubuntu when "ufw" is active, which blocks
multicast by default:
{noformat}
May 12 23:11:46 pheme kernel: [549586.656109] [UFW BLOCK] IN=eth1 OUT=
MAC=01:00:5e:00:00:01:fe:54:00:24:07:4d:08:00 SRC=0.0.0.0 DST=224.0.0.1 LEN=32
TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
May 12 23:11:46 pheme kernel: [549586.656131] [UFW BLOCK] IN=eth0 OUT=
MAC=01:00:5e:00:00:01:00:24:21:ef:35:90:08:00 SRC=0.0.0.0 DST=224.0.0.1 LEN=32
TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
{noformat}
When clustering is disabled, as it is by default, we should *not* try to do any
kind of discovery either.
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