在继续执行nosetests之前,等待postgres在ENTRYPOINT内完全启动的最佳方法是什么？
现在我把我的机器上的启动时间定在50秒左右.所以我只是睡了60秒.这感觉不太好,因为在另一台机器上运行时这可能不起作用.
ENTRYPOINT \
runuser -l postgres -c '/usr/lib/postgresql/9.3/bin/postgres -D /var/lib/postgresql/9.3/main -c config_file=/etc/postgresql/9.3/main/postgresql.conf & ' && \
sleep 60 && \
nosetests --verbose --cover-erase --with-coverage --cover-package=stalker
这是启动postgres的输出：
2017-02-13 13:46:49.541 UTC [9] LOG: database system was interrupted; last known up at 2017-02-13 12:53:23 UTC
2017-02-13 13:47:37.951 UTC [9] LOG: database system was not properly shut down; automatic recovery in progress
2017-02-13 13:47:37.994 UTC [9] LOG: redo starts at 0/1783EA0
2017-02-13 13:47:37.995 UTC [9] LOG: record with zero length at 0/17841E8
2017-02-13 13:47:37.995 UTC [9] LOG: redo done at 0/17841B8
2017-02-13 13:47:37.995 UTC [9] LOG: last completed transaction was at log time 2017-02-13 12:53:23.731984+00
2017-02-13 13:47:38.384 UTC [9] LOG: MultiXact member wraparound protections are now enabled
2017-02-13 13:47:38.387 UTC [7] LOG: database system is ready to accept connections
2017-02-13 13:47:38.387 UTC [13] LOG: autovacuum launcher started
请注意,这与在ENTRYPOINT中运行多个命令的惯例相违背.在这种情况下,我有充分的理由这样做.
最佳答案
感谢@zeppelin建议pg_isready.我最终使用了这个：
原文链接：https://www.f2er.com/docker/436977.html#!/bin/bash
# wait-for-postgres.sh
set -e
cmd="$@"
timer="5"
until runuser -l postgres -c 'pg_isready' 2>/dev/null; do
>&2 echo "Postgres is unavailable - sleeping for $timer seconds"
sleep $timer
done
>&2 echo "Postgres is up - executing command"
exec $cmd
我在我的ENTRYPOINT中使用它：
ENTRYPOINT \
# Start Postgresql
runuser -l postgres -c '/usr/lib/postgresql/9.3/bin/postgres -D /var/lib/postgresql/9.3/main -c config_file=/etc/postgresql/9.3/main/postgresql.conf & ' && \
# Exectute tests when db is up
./wait-for-postgres.sh nosetests --verbose --cover-erase --with-coverage --cover-package=stalker
