为具有默认VPC和安全组的postgres数据库实例创建了新的AWS rds。能够通过pgadmin4连接到db实例，并在创建数据库实例的同一天通过telnet ping通。数据库实例创建后的第二天，无法连接到数据库实例。 从RDS中的最近事件选项卡，可以看到数据库实例正在关闭并自动重新启动，之后我无法连接到数据库实例。 数据库实例状态也是“可用”。
注意：1。两次完成上述过程，在数据库实例创建之后重复相同的错误。对数据库使用相同的安全性和VCP，并且能够在创建数据库实例的当天进行连接。
尝试重新启动，停止，启动，但没有运气无法连接到数据库实例，虽然状态可用。我确信Security和VCP工作正常，因为它适用于其他数据库实例。
需要知道为什么db实例会自动关闭并重启？ 虽然状态可用，但为什么无法连接到db instance ??
以下是AWS Recent Event选项卡的快照 -
[1]：https://i.stack.imgur.com/D54bc.jpg
Log 1 while shut down:
2017-12-17 12:02:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:02:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.158 s, sync=0.002 s, total=0.172 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=17335 kB
2017-12-17 12:07:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:07:53 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.165 s, sync=0.002 s, total=0.181 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=17240 kB
2017-12-17 12:12:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:12:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.160 s, sync=0.011 s, total=0.189 s; sync files=1, longest=0.011 s, average=0.011 s; distance=16384 kB, estimate=17154 kB
2017-12-17 12:17:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:17:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.163 s, sync=0.002 s, total=0.181 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16383 kB, estimate=17077 kB
2017-12-17 12:22:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:22:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.160 s, sync=0.002 s, total=0.176 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=17008 kB
2017-12-17 12:27:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:27:53 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.159 s, sync=0.002 s, total=0.175 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16945 kB
2017-12-17 12:32:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:32:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.158 s, sync=0.002 s, total=0.173 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16383 kB, estimate=16889 kB
2017-12-17 12:37:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:37:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.158 s, sync=0.002 s, total=0.174 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16839 kB
2017-12-17 12:42:52 UTC::@:[3654]:LOG: checkpoint starting: time
2017-12-17 12:42:52 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.280 s, sync=0.003 s, total=0.295 s; sync files=1, longest=0.003 s, average=0.003 s; distance=16384 kB, estimate=16793 kB
2017-12-17 12:47:03 UTC::@:[3651]:LOG: received fast shutdown request
2017-12-17 12:47:03 UTC::@:[3651]:LOG: aborting any active transactions
2017-12-17 12:47:03 UTC::@:[3657]:LOG: autovacuum launcher shutting down
2017-12-17 12:47:03 UTC::@:[3654]:LOG: shutting down
2017-12-17 12:47:03 UTC::@:[3654]:LOG: checkpoint starting: shutdown immediate
2017-12-17 12:47:03 UTC::@:[3654]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.001 s, sync=0.002 s, total=0.059 s; sync files=1, longest=0.002 s, average=0.002 s; distance=32765 kB, estimate=32765 kB
2017-12-17 12:47:03 UTC::@:[3651]:LOG: database system is shut down
2017-12-17 12:47:05 UTC::@:[949]:LOG: database system was shut down at 2017-12-17 12:47:03 UTC
2017-12-17 12:47:05 UTC::@:[949]:LOG: MultiXact member wraparound protections are now enabled
2017-12-17 12:47:05 UTC::@:[947]:LOG: database system is ready to accept connections
2017-12-17 12:47:05 UTC::@:[953]:LOG: autovacuum launcher started
2017-12-17 12:52:05 UTC::@:[950]:LOG: checkpoint starting: time
2017-12-17 12:52:05 UTC::@:[950]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.157 s, sync=0.002 s, total=0.176 s; sync files=1, longest=0.002 s, average=0.002 s; distance=2 kB, estimate=2 kB
Log 2:
2017-12-16 16:34:10 UTC::@:[3651]:WARNING: unrecognized configuration parameter "rds.logical_replication"
2017-12-16 16:34:10 UTC::@:[3651]:LOG: redirecting log output to logging collector process
2017-12-16 16:34:10 UTC::@:[3651]:HINT: Future log output will appear in directory "/rdsdbdata/log/error".
2017-12-17 12:47:05 UTC::@:[947]:WARNING: unrecognized configuration parameter "rds.logical_replication"
2017-12-17 12:47:05 UTC::@:[947]:LOG: redirecting log output to logging collector process
2017-12-17 12:47:05 UTC::@:[947]:HINT: Future log output will appear in directory "/rdsdbdata/log/error".
2017-12-17 13:10:21 UTC::@:[3383]:WARNING: unrecognized configuration parameter "rds.logical_replication"
2017-12-17 13:10:21 UTC::@:[3383]:LOG: redirecting log output to logging collector process
2017-12-17 13:10:21 UTC::@:[3383]:HINT: Future log output will appear in directory "/rdsdbdata/log/error".
记录3：
2017-12-17 13:10:21 UTC::@:[3385]:LOG: database system was interrupted; last known up at 2017-12-17 12:52:05 UTC
2017-12-17 13:10:21 UTC::@:[3385]:LOG: database system was not properly shut down; automatic recovery in progress
2017-12-17 13:10:21 UTC::@:[3385]:LOG: redo starts at 0/F7000878
2017-12-17 13:10:21 UTC::@:[3385]:LOG: invalid record length at 0/F80008D8: wanted 24, got 0
2017-12-17 13:10:21 UTC::@:[3385]:LOG: redo done at 0/F80008A0
2017-12-17 13:10:21 UTC::@:[3385]:LOG: last completed transaction was at log time 2017-12-17 12:53:15.163928+00
2017-12-17 13:10:21 UTC::@:[3385]:LOG: checkpoint starting: end-of-recovery immediate
2017-12-17 13:10:21 UTC::@:[3385]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 0 recycled; write=0.000 s, sync=0.002 s, total=0.015 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:10:21 UTC::@:[3385]:LOG: MultiXact member wraparound protections are now enabled
2017-12-17 13:10:21 UTC::@:[3383]:LOG: database system is ready to accept connections
2017-12-17 13:10:21 UTC::@:[3389]:LOG: autovacuum launcher started
2017-12-17 13:15:21 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:15:21 UTC::@:[3386]:LOG: checkpoint complete: wrote 2 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.261 s, sync=0.002 s, total=0.276 s; sync files=2, longest=0.002 s, average=0.001 s; distance=4 kB, estimate=4 kB
2017-12-17 13:20:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:20:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.156 s, sync=0.002 s, total=0.184 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16379 kB, estimate=16379 kB
2017-12-17 13:25:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:25:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.155 s, sync=0.002 s, total=0.169 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:30:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:30:23 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.158 s, sync=0.002 s, total=0.171 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:35:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:35:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.161 s, sync=0.003 s, total=0.176 s; sync files=1, longest=0.003 s, average=0.003 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:40:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:40:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.157 s, sync=0.002 s, total=0.170 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:45:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:45:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.160 s, sync=0.002 s, total=0.178 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:50:22 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:50:22 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.156 s, sync=0.002 s, total=0.169 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
2017-12-17 13:55:23 UTC::@:[3386]:LOG: checkpoint starting: time
2017-12-17 13:55:23 UTC::@:[3386]:LOG: checkpoint complete: wrote 1 buffers (0.0%); 0 transaction log file(s) added, 0 removed, 1 recycled; write=0.155 s, sync=0.002 s, total=0.169 s; sync files=1, longest=0.002 s, average=0.002 s; distance=16384 kB, estimate=16384 kB
----------------------- END OF LOG ----------------------