On 12/3/20 9:44 AM, Richard Shaw wrote:
On Thu, Dec 3, 2020 at 2:41 AM Gargoyle <g@xxxxxxxxxx
<mailto:g@xxxxxxxxxx>> wrote:
On 02/12/2020 16:09, Richard Shaw wrote:
Nope, it's an external networked device. They always "boot up" at
the same time, but the computer which runs the service boots up
faster than the device I need to connect to.
What difference does that make - what's the actual problem you're
having?
The service starts and tries to connect but the other system is up far
enough yet to receive connections so it just fails. The only solution so
far is to restart the service manually later, which is what I'm trying
to work around.
For remote connections, specially when all servers are restarted at the
same time I use a shell script on ExecStartPre that check for an open
port on the remote server.
My case it is a database server that takes a long time on the firmware
initialization, and the application servers start really fast, before
the database server is started.
########### wait-tcp-port <ip_or_hostname> <port>
#!/bin/bash
IP=$1
PORT=$2
MAX_TRIES=300
OPEN_RC=2
COUNTER=1
until [[ $OPEN_RC -eq 0 || $COUNTER -gt $MAX_TRIES ]]; do
exec 3>&2 2>/dev/null
exec 6<>/dev/tcp/$IP/$PORT
OPEN_RC=$?
exec 2>&3
if [ $OPEN_RC -eq 0 ]; then
exec 6>&- # close output connection
exec 6<&- # close input connection
echo Port $IP:$PORT open
else
sleep 2
COUNTER=$[$COUNTER +1]
fi
done
if [ $COUNTER -gt $MAX_TRIES ]; then
echo Max tries waiting for port $IP:$PORT reached
exit 100
fi
Also, is this a standard Fedora package? (So there may at least be a
weak link to continued discussion on this list)
No, it's something custom. Thanks for the feedback though, I pretty much
already decided to try the timer delay method
Thanks,
Richard
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