AJN's questions

Exim 在具有公共 IP (scaleway.net) 的公共云提供商的新配置 VM 上配置

目的：

能够从 CLI（或脚本）向公共目标收件人（gmail、yahoo、...）发送邮件

结果：

Exim4 日志文件/var/log/exim4/mainlog显示所有测试服务器（gmail、free.fr、online.net）的“连接超时”

配置细节：

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.5 LTS
Release:    16.04
Codename:   xenial

• 服务器上没有配置防火墙，也没有来自云提供商的规则。
• 解析的 smtp 服务器 IP 地址（来自 exim 日志文件）是可 ping 的。

使用不同的 smtp 服务器进行测试：（gmail、free.fr、online.net）

猫 /etc/exim4/update-exim4.conf.conf

# /etc/exim4/update-exim4.conf.conf
#
# Edit this file and /etc/mailname by hand and execute update-exim4.conf
# yourself or use 'dpkg-reconfigure exim4-config'
#
# Please note that this is _not_ a dpkg-conffile and that automatic changes
# to this file might happen. The code handling this will honor your local
# changes, so this is usually fine, but will break local schemes that mess
# around with multiple versions of the file.
#
# update-exim4.conf uses this file to determine variable values to generate
# exim configuration macros for the configuration file.
#
# Most settings found in here do have corresponding questions in the
# Debconf configuration, but not all of them.
#
# This is a Debian specific file

dc_eximconfig_configtype='smarthost'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1 ; ::1'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.online.net::587'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='false'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool

使用 smtp 服务器为每个测试正确配置的帐户和密码：

猫 /etc/exim4/passwd.client

#gmail-smtp.1.google.com:[email protected]:pass1
#smtp.online.net:[email protected]:pass2
smtp.free.fr:[email protected]:pass2

root@scw-5c50c6:~# tail -f /var/log/exim4/mainlog

root@scw-5c50c6:~# tail -f /var/log/exim4/mainlog
2018-10-27 17:32:47 1gGSDM-0002ib-5Y == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host
2018-10-27 17:32:47 1gGSKT-0002sr-C6 == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host
2018-10-27 17:32:47 1gGSF6-0002ij-UA == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host
2018-10-27 17:32:47 1gGSJs-0002no-EM == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host
2018-10-27 17:32:47 1gGSHC-0002is-0H == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host
2018-10-27 17:32:47 End queue run: pid=12074
2018-10-27 17:32:53 1gGSQA-00038q-A1 H=smtpauth-dc2.online.net [62.210.16.40] Connection timed out
2018-10-27 17:32:53 1gGSQA-00038q-A1 == [email protected] R=smarthost T=remote_smtp_smarthost defer (110): Connection timed out

2018-10-27 17:47:12 1gGSg4-00039P-CW <= root@localhost U=root P=local S=369
2018-10-27 17:47:12 1gGSg4-00039P-CW == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host


2018-10-27 18:02:34 1gGSst-0003JZ-5k H=smtp.free.fr [212.27.48.4] Connection timed out
2018-10-27 18:02:34 1gGSst-0003JZ-5k == [email protected] R=smarthost T=remote_smtp_smarthost defer (110): Connection timed out
2018-10-27 18:03:09 1gGSvV-0003KT-9k <= root@localhost U=root P=local S=369
2018-10-27 18:03:09 1gGSvV-0003KT-9k == [email protected] R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host

我在配置中遗漏了什么吗？

Linux环境：Debian、Ubuntu、Centos

目标：
测试设置警报并以不同cpu百分比触发不同警报的监控程序。
例如：(30-50%)、(51-70%) 和 >90%

所以我需要一个可以模拟每个核心的特定 cpu 百分比的 cpu 压力器。
stress-mg看起来是最先进的。

根据其文档http://kernel.ubuntu.com/~cking/stress-ng/可以将负载值设置在 0 到 100% 之间：

-l P --cpu-load P 以 P % 加载 CPU，0=sleep，100=full load（见 -c）

stress-ng -c 1 -p 30

压力-ng：信息：[12650]调度猪：0 I/O-Sync，1 CPU，0 VM-mmap，0 HDD-Write，0 Fork，0 Context-switch，30 Pipe，0 Cache，0 Socket，0 Yield, 0 Fallocate, 0 Flock, 0 Affinity, 0 Timer, 0 Dentry, 0 Urandom, 0 Float, 0 Int, 0 Semaphore, 0 Open, 0 SigQueue, 0 Poll

不希望的结果：
但它似乎不起作用，所有核心都被占用 100%

任何想法如何实现这一目标？

要为Apache生成 SSL 证书文件，我使用以下命令：

 openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/apache.key -out /etc/apache2/ssl/apache.cert

我用这些参数手动输入它：

国家名称（2 个字母代码）[AU]：AU
州或省名称（全名）：Myname
[Some-State]：Some-State
地区名称（例如，城市）[]：城市
组织名称（例如，公司）[ Internet Widgits Pty Ltd]：Internet
组织单位名称（例如，section）[]：Section
Common Name（例如服务器 FQDN 或您的姓名）[]：yourname
电子邮件地址 []：[email protected]

是否可以使用选项从文件或直接从 OpenSSL 命令行输入它们？

OpenSSL 手册页中没有任何提示。