$ telnet メールサーバホスト名 25
Trying 192.168.x.x...
Connected to 192.168.x.x.
Escape character is '^]'
220 メールサーバホスト名 ESMTP Postfix
ehlo testhost
250-メールサーバホスト名
250-＜以下省略＞
mail from: <>
250 2.1.0 Ok
rcpt to: nothing@your.domain.here
250 2.1.5 Ok
存在しないアドレスを指定した「rcpt to: nothing@your.domain.here」に対する応答として「550 5.1.1 ～」が返ってくることを期待したものの、「250 2.1.5 Ok」という、メールアドレスが存在する場合と同じ応答となっている。
[root@xxxxxxxxxxx mysql]# ls -ltr /var/lib/mysql/binlog*
-rw-r-----. 1 mysql mysql 1076027128 Apr 11 12:15 /var/lib/mysql/binlog.000401
-rw-r-----. 1 mysql mysql 895282121 Apr 23 06:48 /var/lib/mysql/binlog.000402
-rw-r-----. 1 mysql mysql 1076428654 Apr 23 19:12 /var/lib/mysql/binlog.000403
-rw-r-----. 1 mysql mysql 596357576 Apr 24 03:25 /var/lib/mysql/binlog.000404
-rw-r-----. 1 mysql mysql 1074553571 Apr 24 22:57 /var/lib/mysql/binlog.000405
-rw-r-----. 1 mysql mysql 1075609896 Apr 26 11:28 /var/lib/mysql/binlog.000406
-rw-r-----. 1 mysql mysql 1075981972 Apr 27 18:37 /var/lib/mysql/binlog.000407
-rw-r-----. 1 mysql mysql 1075913505 Apr 28 00:47 /var/lib/mysql/binlog.000408
-rw-r-----. 1 mysql mysql 1075838660 Apr 28 05:05 /var/lib/mysql/binlog.000409
-rw-r-----. 1 mysql mysql 1075205513 Apr 28 08:48 /var/lib/mysql/binlog.000410
-rw-r-----. 1 mysql mysql 5651277 Apr 29 23:47 /var/lib/mysql/binlog.000411
-rw-r-----. 1 mysql mysql 2052256 Apr 29 23:56 /var/lib/mysql/binlog.000412
-rw-r-----. 1 mysql mysql 101787 Apr 30 00:01 /var/lib/mysql/binlog.000413
-rw-r-----. 1 mysql mysql 3171581 Apr 30 03:19 /var/lib/mysql/binlog.000414
-rw-r-----. 1 mysql mysql 1074621728 May 3 02:47 /var/lib/mysql/binlog.000415
-rw-r-----. 1 mysql mysql 1074747087 May 5 18:27 /var/lib/mysql/binlog.000416
-rw-r-----. 1 mysql mysql 1074122275 May 6 01:02 /var/lib/mysql/binlog.000417
-rw-r-----. 1 mysql mysql 1076183303 May 6 16:09 /var/lib/mysql/binlog.000418
-rw-r-----. 1 mysql mysql 1074003040 May 7 01:08 /var/lib/mysql/binlog.000419
-rw-r-----. 1 mysql mysql 320 May 7 01:08 /var/lib/mysql/binlog.index
-rw-r-----. 1 mysql mysql 286409863 May 7 16:07 /var/lib/mysql/binlog.000420
[root@xxxxxxxxxxx mysql]#
とりあえず、binlog関連の設定を「show variables like ‘binlog%’;」を実行して確認してみる
[root@xxxxxxxxxxx mysql]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 50827
Server version: 8.0.45 Source distribution
Copyright (c) 2000, 2026, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show variables like 'binlog%';
+------------------------------------------------+--------------+
| Variable_name | Value |
+------------------------------------------------+--------------+
| binlog_cache_size | 32768 |
| binlog_checksum | CRC32 |
| binlog_direct_non_transactional_updates | OFF |
| binlog_encryption | OFF |
| binlog_error_action | ABORT_SERVER |
| binlog_expire_logs_auto_purge | ON |
| binlog_expire_logs_seconds | 2592000 |
| binlog_format | ROW |
| binlog_group_commit_sync_delay | 0 |
| binlog_group_commit_sync_no_delay_count | 0 |
| binlog_gtid_simple_recovery | ON |
| binlog_max_flush_queue_time | 0 |
| binlog_order_commits | ON |
| binlog_rotate_encryption_master_key_at_startup | OFF |
| binlog_row_event_max_size | 8192 |
| binlog_row_image | FULL |
| binlog_row_metadata | MINIMAL |
| binlog_row_value_options | |
| binlog_rows_query_log_events | OFF |
| binlog_stmt_cache_size | 32768 |
| binlog_transaction_compression | OFF |
| binlog_transaction_compression_level_zstd | 3 |
| binlog_transaction_dependency_history_size | 25000 |
| binlog_transaction_dependency_tracking | COMMIT_ORDER |
+------------------------------------------------+--------------+
24 rows in set (0.00 sec)
mysql>
mysql> PURGE BINARY LOGS BEFORE '2026-05-01 00:00:00';
Query OK, 0 rows affected (0.02 sec)
mysql> show binary logs;
+---------------+------------+-----------+
| Log_name | File_size | Encrypted |
+---------------+------------+-----------+
| binlog.000415 | 1074621728 | No |
| binlog.000416 | 1074747087 | No |
| binlog.000417 | 1074122275 | No |
| binlog.000418 | 1076183303 | No |
| binlog.000419 | 1074003040 | No |
| binlog.000420 | 377894939 | No |
+---------------+------------+-----------+
6 rows in set (0.00 sec)
mysql>
ファイルは・・・削除されていますね
[root@xxxxxxxxxxx mysql]# ls -ltr /var/lib/mysql/binlog*
-rw-r-----. 1 mysql mysql 1074621728 May 3 02:47 /var/lib/mysql/binlog.000415
-rw-r-----. 1 mysql mysql 1074747087 May 5 18:27 /var/lib/mysql/binlog.000416
-rw-r-----. 1 mysql mysql 1074122275 May 6 01:02 /var/lib/mysql/binlog.000417
-rw-r-----. 1 mysql mysql 1076183303 May 6 16:09 /var/lib/mysql/binlog.000418
-rw-r-----. 1 mysql mysql 1074003040 May 7 01:08 /var/lib/mysql/binlog.000419
-rw-r-----. 1 mysql mysql 96 May 7 16:25 /var/lib/mysql/binlog.index
-rw-r-----. 1 mysql mysql 383435241 May 7 16:25 /var/lib/mysql/binlog.000420
[root@xxxxxxxxxxx mysql]#
[root@xxxxxxxxxxx ~]# ls -ltr /var/lib/mysql/bin*
-rw-r-----. 1 mysql mysql 1074747087 May 5 18:27 /var/lib/mysql/binlog.000416
-rw-r-----. 1 mysql mysql 1074122275 May 6 01:02 /var/lib/mysql/binlog.000417
-rw-r-----. 1 mysql mysql 1076183303 May 6 16:09 /var/lib/mysql/binlog.000418
-rw-r-----. 1 mysql mysql 1074003040 May 7 01:08 /var/lib/mysql/binlog.000419
-rw-r-----. 1 mysql mysql 1074323672 May 8 03:18 /var/lib/mysql/binlog.000420
-rw-r-----. 1 mysql mysql 1073965591 May 8 16:47 /var/lib/mysql/binlog.000421
-rw-r-----. 1 mysql mysql 1074897443 May 10 12:39 /var/lib/mysql/binlog.000422
-rw-r-----. 1 mysql mysql 128 May 10 12:39 /var/lib/mysql/binlog.index
-rw-r-----. 1 mysql mysql 576882057 May 11 14:17 /var/lib/mysql/binlog.000423
[root@xxxxxxxxxxx ~]#
さらに翌日確認して、間違いなく増加率が激減していることを確認した
[root@xxxxxxxxxxx ~]# ls -ltr /var/lib/mysql/bin*
-rw-r-----. 1 mysql mysql 1074747087 May 5 18:27 /var/lib/mysql/binlog.000416
-rw-r-----. 1 mysql mysql 1074122275 May 6 01:02 /var/lib/mysql/binlog.000417
-rw-r-----. 1 mysql mysql 1076183303 May 6 16:09 /var/lib/mysql/binlog.000418
-rw-r-----. 1 mysql mysql 1074003040 May 7 01:08 /var/lib/mysql/binlog.000419
-rw-r-----. 1 mysql mysql 1074323672 May 8 03:18 /var/lib/mysql/binlog.000420
-rw-r-----. 1 mysql mysql 1073965591 May 8 16:47 /var/lib/mysql/binlog.000421
-rw-r-----. 1 mysql mysql 1074897443 May 10 12:39 /var/lib/mysql/binlog.000422
-rw-r-----. 1 mysql mysql 128 May 10 12:39 /var/lib/mysql/binlog.index
-rw-r-----. 1 mysql mysql 867993952 May 12 11:46 /var/lib/mysql/binlog.000423
[root@xxxxxxxxxxx ~]#
2026/05/21追記
落ち着いたかと思ったら、またかーーー
-rw-r-----. 1 mysql mysql 56 Nov 16 2021 auto.cnf
-rw-r-----. 1 mysql mysql 880718553 May 14 03:39 binlog.000424
-rw-r-----. 1 mysql mysql 1074983980 May 15 22:05 binlog.000425
-rw-r-----. 1 mysql mysql 1074458947 May 16 01:00 binlog.000426
-rw-r-----. 1 mysql mysql 1076353655 May 16 04:11 binlog.000427
-rw-r-----. 1 mysql mysql 1075894927 May 16 11:45 binlog.000428
-rw-r-----. 1 mysql mysql 1076430757 May 16 20:30 binlog.000429
-rw-r-----. 1 mysql mysql 1074418130 May 17 01:11 binlog.000430
-rw-r-----. 1 mysql mysql 1075734983 May 17 17:52 binlog.000431
-rw-r-----. 1 mysql mysql 1074210923 May 18 13:17 binlog.000432
-rw-r-----. 1 mysql mysql 1074818836 May 18 19:42 binlog.000433
-rw-r-----. 1 mysql mysql 1075645558 May 19 00:18 binlog.000434
-rw-r-----. 1 mysql mysql 1074848030 May 19 10:46 binlog.000435
-rw-r-----. 1 mysql mysql 1075579091 May 19 15:20 binlog.000436
-rw-r-----. 1 mysql mysql 1076234338 May 19 20:25 binlog.000437
-rw-r-----. 1 mysql mysql 618166201 May 20 03:45 binlog.000438
-rw-r-----. 1 mysql mysql 1075233776 May 20 15:03 binlog.000439
-rw-r-----. 1 mysql mysql 1076237754 May 20 18:18 binlog.000440
-rw-r-----. 1 mysql mysql 1074276162 May 20 21:19 binlog.000441
-rw-r-----. 1 mysql mysql 227580182 May 21 11:19 binlog.000442
-rw-r-----. 1 mysql mysql 304 May 20 21:19 binlog.index
もう set PERSIST binlog_expire_logs_seconds=1; を設定してしまおう・・・・(0が無限扱いだといやなので数値入れとくか的な)
mysql> set PERSIST binlog_expire_logs_seconds=1;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like 'binlog%';
+------------------------------------------------+--------------+
| Variable_name | Value |
+------------------------------------------------+--------------+
| binlog_cache_size | 32768 |
| binlog_checksum | CRC32 |
| binlog_direct_non_transactional_updates | OFF |
| binlog_encryption | OFF |
| binlog_error_action | ABORT_SERVER |
| binlog_expire_logs_auto_purge | ON |
| binlog_expire_logs_seconds | 1 |
| binlog_format | ROW |
| binlog_group_commit_sync_delay | 0 |
| binlog_group_commit_sync_no_delay_count | 0 |
| binlog_gtid_simple_recovery | ON |
| binlog_max_flush_queue_time | 0 |
| binlog_order_commits | ON |
| binlog_rotate_encryption_master_key_at_startup | OFF |
| binlog_row_event_max_size | 8192 |
| binlog_row_image | FULL |
| binlog_row_metadata | MINIMAL |
| binlog_row_value_options | |
| binlog_rows_query_log_events | OFF |
| binlog_stmt_cache_size | 32768 |
| binlog_transaction_compression | OFF |
| binlog_transaction_compression_level_zstd | 3 |
| binlog_transaction_dependency_history_size | 25000 |
| binlog_transaction_dependency_tracking | COMMIT_ORDER |
+------------------------------------------------+--------------+
24 rows in set (0.00 sec)
mysql> perge binary logs before '2026-05-20 00:00:00';
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'perge binary logs before '2026-05-20 00:00:00'' at line 1
mysql> purge binary logs before '2026-05-20 00:00:00';
Query OK, 0 rows affected (0.12 sec)
mysql> show binary logs;
+---------------+------------+-----------+
| Log_name | File_size | Encrypted |
+---------------+------------+-----------+
| binlog.000438 | 618166201 | No |
| binlog.000439 | 1075233776 | No |
| binlog.000440 | 1076237754 | No |
| binlog.000441 | 1074276162 | No |
| binlog.000442 | 234276939 | No |
+---------------+------------+-----------+
5 rows in set (0.00 sec)
mysql> purge binary logs before '2026-05-21 00:00:00';
Query OK, 0 rows affected, 1 warning (0.05 sec)
mysql> show binary logs;
+---------------+-----------+-----------+
| Log_name | File_size | Encrypted |
+---------------+-----------+-----------+
| binlog.000442 | 234276939 | No |
+---------------+-----------+-----------+
1 row in set (0.00 sec)
mysql>
error alert
Lcm prechecks detected 1 issue that would cause upgrade failures.
Check 'test_ntp_server_reachability' failed: Failure reason: Cannot upgrade if the configured NTP server(s): ['0.pool.ntp.org', '1.pool.ntp.org'] are not reachable. For details read article 6401
[root@NTNX-4bc9a811-A ~]# cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift
# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
# Enable kernel synchronization of the real-time clock (RTC).
rtcsync
# Enable hardware timestamping on all interfaces that support it.
#hwtimestamp *
# Increase the minimum number of selectable sources required to adjust
# the system clock.
#minsources 2
# Allow NTP client access from local network.
#allow 192.168.0.0/16
# Serve time even if not synchronized to a time source.
#local stratum 10
# Specify file containing keys for NTP authentication.
keyfile /etc/chrony.keys
# Get TAI-UTC offset and leap seconds from the system tz database.
leapsectz right/UTC
# Specify directory for log files.
logdir /var/log/chrony
# Select which information is logged.
#log measurements statistics tracking
port 0
cmdport 0
server 1.pool.ntp.org maxpoll 10 iburst
server 0.pool.ntp.org maxpoll 10 iburst
server 192.168.1.1 maxpoll 10 iburst
[root@NTNX-4bc9a811-A ~]#
nutanix@NTNX-4bc9a811-A-CVM:192.168.1.14:~$ ncc health_checks network_checks check_ntp
####################################################
# TIMESTAMP : Thu Jul 09 01:52:10 2026 (UTC +0000) #
####################################################
Cluster Name: cvm
Cluster Id: 3772327690115644291
Cluster UUID: 00064e84-58d6-fd69-345a-000c29b67b83
Cluster Version: 6.8.1
NCC Version: 5.0.1-83db8d0f
CVM ID(Svmid) : 2
CVM external IP : 192.168.1.14
Hypervisor IP : 192.168.1.13
Hypervisor version : Nutanix 20230302.101026
Node serial : 61e640f9-e1fe-4ba3-a4cc-8c2384c95c9a
Model : CommunityEdition
Node Position : A
Block S/N : 4bc9a811
Running : health_checks network_checks check_ntp
[==================================================] 100%
/health_checks/network_checks/check_ntp [ WARN ]
---------------------------------------------------------------------------------------------+
Detailed information for check_ntp:
Node 192.168.1.14:
WARN: NTP servers configured on CVM (['192.168.1.1']) differ from those configured in the cluster (['0.pool.ntp.org', '1.pool.ntp.org', '192.168.1.1']).
WARN: The host (192.168.1.13) is not synchronizing with any NTP server. This might occur if none of the configured NTP servers are available or you are currently experiencing network instability determined by the high offset/high jitter.
Refer to KB 4519 (http://portal.nutanix.com/kb/4519) for details on check_ntp or Recheck with: ncc health_checks network_checks check_ntp --cvm_list=192.168.1.14
+-----------------------+
| State | Count |
+-----------------------+
| Warning | 1 |
| Total Plugins | 1 |
+-----------------------+
Plugin output written to /home/nutanix/data/logs/ncc-output-latest.log
nutanix@NTNX-4bc9a811-A-CVM:192.168.1.14:~$
nutanix@NTNX-4bc9a811-A-CVM:192.168.1.14:~$ ncc health_checks network_checks check_ntp
####################################################
# TIMESTAMP : Thu Jul 09 01:57:28 2026 (UTC +0000) #
####################################################
Cluster Name: cvm
Cluster Id: 3772327690115644291
Cluster UUID: 00064e84-58d6-fd69-345a-000c29b67b83
Cluster Version: 6.8.1
NCC Version: 5.0.1-83db8d0f
CVM ID(Svmid) : 2
CVM external IP : 192.168.1.14
Hypervisor IP : 192.168.1.13
Hypervisor version : Nutanix 20230302.101026
Node serial : 61e640f9-e1fe-4ba3-a4cc-8c2384c95c9a
Model : CommunityEdition
Node Position : A
Block S/N : 4bc9a811
Running : health_checks network_checks check_ntp
[==================================================] 100%
/health_checks/network_checks/check_ntp [ ERR ]
---------------------------------------------------------------------------------------------+
Detailed information for check_ntp:
Node 192.168.1.14:
ERR : node (service_vm_id: 2) : NTP synchronized to server which is neither in the cluster nor in the list of allowed NTP servers
WARN: The host (192.168.1.13) is not synchronizing with any NTP server. This might occur if none of the configured NTP servers are available or you are currently experiencing network instability determined by the high offset/high jitter.
Refer to KB 4519 (http://portal.nutanix.com/kb/4519) for details on check_ntp or Recheck with: ncc health_checks network_checks check_ntp --cvm_list=192.168.1.14
One or more plugins generated ERROR as there were insufficient data to validate results. Please resolve other reported issues and re-run the health checks.
+-----------------------+
| State | Count |
+-----------------------+
| Error | 1 |
| Total Plugins | 1 |
+-----------------------+
Plugin output written to /home/nutanix/data/logs/ncc-output-latest.log
nutanix@NTNX-4bc9a811-A-CVM:192.168.1.14:~$
