Kubernetes readiness probes experiments (with PostgreSQL)

readiness_probes_experiments.sh

while true; do PGCONNECT_TIMEOUT=2 psql -U receiptbank -h monolith-postgresql --list >/dev/null && date +'Host: %Y-%m-%d %H:%M:%S.%6N' || echo -n .; sleep 0.05; done
while true; do PGCONNECT_TIMEOUT=2 psql -U receiptbank -h 0.0.0.0 --list >/dev/null && date +'IP:   %Y-%m-%d %H:%M:%S.%6N' || echo -n .; sleep 0.05; done
while true; do PGCONNECT_TIMEOUT=2 psql -U receiptbank --list >/dev/null && date +'Sock: %Y-%m-%d %H:%M:%S.%6N' || echo -n .; sleep 0.05; done

while ! kubectl -n probes logs --timestamps -f `kubectl get pods -n probes -l app=monolith -l component=postgresql --show-kind=false --no-headers 2>/dev/null|cut -d' ' -f1`; do echo -n .; sleep 0.1; done

while ! kubectl-exec-in probes `kubectl get pods -n probes -l app=monolith -l component=postgresql --show-kind=false --no-headers 2>/dev/null|cut -d' ' -f1` /bin/bash -lc "while true; do PGCONNECT_TIMEOUT=2 psql -U postgres -h 0.0.0.0 --list >/dev/null && date +'IP:   %Y-%m-%d %H:%M:%S.%6N' || echo -n .; sleep 0.05; done" 2>/dev/null; do echo -n .; sleep 0.1; done

while ! kubectl-exec-in probes `kubectl get pods -n probes -l app=monolith -l component=postgresql --show-kind=false --no-headers 2>/dev/null|cut -d' ' -f1` /bin/bash -lc "while true; do PGCONNECT_TIMEOUT=2 psql -U postgres --list >/dev/null && date +'Sock: %Y-%m-%d %H:%M:%S.%6N' || echo -n .; sleep 0.05; done" 2>/dev/null; do echo -n .; sleep 0.1; done