我有以下由商业托管商托管的 Ubuntu 服务器。托管商说他不知道。附上一张屏幕截图，从中top可以看到哪些进程正在减慢服务器的速度。它或多或少总是fail2ban-server如此mysqld- 甚至没有运行任何查询。我可以说服务器是睡眠。
这可能是什么，我可以改进什么？服务器几分钟没有响应，过了一会儿，负载几乎降到了 0。我可以说，这就像是一种重复波浪。
转储自/etc/os-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=21.10
DISTRIB_CODENAME=impish
DISTRIB_DESCRIPTION="Ubuntu 21.10"
PRETTY_NAME="Ubuntu 21.10"
NAME="Ubuntu"
VERSION_ID="21.10"
VERSION="21.10 (Impish Indri)"
VERSION_CODENAME=impish
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=impish
根据要求，var/log/fail2ban.log
2022-05-25 10:02:59,011 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:02:59
2022-05-25 10:04:09,378 [466]: INFO [postfix-sasl] Found 141.98.* - 2022-05-25 10:04:09
2022-05-25 10:04:14,324 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:04:14
2022-05-25 10:05:21,666 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:05:21
2022-05-25 10:06:28,512 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:06:28
2022-05-25 10:06:29,031 fail2ban.actions [466]: WARNING [sshd] 117.50.* already banned
2022-05-25 10:07:35,495 [466]: INFO [postfix-sasl] Found 45.125.* - 2022-05-25 10:07:35
2022-05-25 10:07:39,914 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:07:39
2022-05-25 10:08:45,731 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:08:45
2022-05-25 10:09:58,390 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:09:58
2022-05-25 10:10:55,980 [466]: INFO [postfix-sasl] Found 185.36.81.192 - 2022-05-25 10:10:55
2022-05-25 10:11:04,588 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:11:03
2022-05-25 10:12:15,655 [466]: INFO [sshd] Found 117.50.* - 2022-05-25 10:12:15
2022-05-25 10:12:15,846 fail2ban.actions [466]: WARNING [sshd] 117.50.* already banned
2022-05-25 10:22:15,401 fail2ban.actions [466]: NOTICE [sshd] Unban 117.50.*
2022-05-25 10:23:20,222 [466]: INFO [postfix-sasl] Found 141.98.* - 2022-05-25 10:23:19
2022-05-25 10:26:20,459 [466]: INFO [postfix-sasl] Found 141.98.* - 2022-05-25 10:26:20
2022-05-25 10:31:19,095 [466]: WARNING [sshd] Simulate NOW in operation since found time has too large deviation 1653474410.0 ~ 1653474679.0946503 +/- 60
2022-05-25 10:31:19,144 [466]: WARNING [webmin-auth] Simulate NOW in operation since found time has too large deviation 1653474410.0 ~ 1653474679.1440747 +/- 60
2022-05-25 10:31:19,220 [466]: WARNING [webmin-auth] Please check jail has possibly a timezone issue. Line with odd timestamp: May 25 10:26:50 *** gnome-keyring-daemon[1064]: asked to register item /org/freedesktop/secrets/collection/login/2, but it's already registered
2022-05-25 10:31:19,220 [466]: WARNING [sshd] Please check jail has possibly a timezone issue. Line with odd timestamp: May 25 10:26:50 *** gnome-keyring-daemon[1064]: asked to register item /org/freedesktop/secrets/collection/login/2, but it's already registered
2022-05-25 10:32:45,859 [466]: WARNING [postfix] Simulate NOW in operation since found time has too large deviation 1653474686.0 ~ 1653474765.8594735 +/- 60
2022-05-25 10:32:46,309 [466]: WARNING [postfix-sasl] Simulate NOW in operation since found time has too large deviation 1653474686.0 ~ 1653474766.3090467 +/- 60
2022-05-25 10:32:46,483 [466]: WARNING [postfix-sasl] Please check jail has possibly a timezone issue. Line with odd timestamp: May 25 10:31:26 *** postfix/anvil[265867]: statistics: max connection count 1 for (smtp:141.98.10.27) at May 25 10:23:17
2022-05-25 10:32:46,309 [466]: WARNING [dovecot] Simulate NOW in operation since found time has too large deviation 1653474686.0 ~ 1653474766.3098185 +/- 60
2022-05-25 10:32:46,483 [466]: WARNING [postfix] Please check jail has possibly a timezone issue. Line with odd timestamp: May 25 10:31:26 *** postfix/anvil[265867]: statistics: max connection count 1 for (smtp:141.98.10.27) at May 25 10:23:17
2022-05-25 10:32:46,567 [466]: WARNING [dovecot] Please check jail has possibly a timezone issue. Line with odd timestamp: May 25 10:31:26 *** postfix/anvil[265867]: statistics: max connection count 1 for (smtp:141.98.10.27) at May 25 10:23:17
2022-05-25 10:39:03,132 [466]: INFO [postfix-sasl] Found 45.125.* - 2022-05-25 10:36:39
2022-05-25 10:39:52,799 [466]: INFO [sshd] Found 42.200.* - 2022-05-25 10:39:52