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CLOUDSTACK-7841: Gracefully reload haproxy config

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The old way would disconnect all the existing connections through haproxy when
reload the config.

This new way would ensure that all the existing connections would still alive
after reload the config.
This commit is contained in:
Sheng Yang 2014-11-04 16:26:23 -08:00
parent a43fba64da
commit c15ed74f63
1 changed files with 2 additions and 9 deletions
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11
systemvm/patches/debian/config/root/reconfigLB.sh
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@ -23,23 +23,16 @@ new_config=$1
# save previous state
mv /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.old
mv /var/run/haproxy.pid /var/run/haproxy.pid.old
mv $new_config /etc/haproxy/haproxy.cfg
kill -TTOU $(cat /var/run/haproxy.pid.old)
sleep 2
if haproxy -D -p /var/run/haproxy.pid -f /etc/haproxy/haproxy.cfg; then
if haproxy -p /var/run/haproxy.pid -f /etc/haproxy/haproxy.cfg -sf $(cat /var/run/haproxy.pid); then
logger -t cloud "New haproxy instance successfully loaded, stopping previous one."
kill -KILL $(cat /var/run/haproxy.pid.old)
rm -f /var/run/haproxy.pid.old
ret=0
else
logger -t cloud "New instance failed to start, resuming previous one."
kill -TTIN $(cat /var/run/haproxy.pid.old)
rm -f /var/run/haproxy.pid
mv /var/run/haproxy.pid.old /var/run/haproxy.pid
mv /etc/haproxy/haproxy.cfg $new_config
mv /etc/haproxy/haproxy.cfg.old /etc/haproxy/haproxy.cfg
haproxy -p /var/run/haproxy.pid -f /etc/haproxy/haproxy.cfg -sf $(cat /var/run/haproxy.pid)
ret=1
fi