阿里云邮箱服务器，centos8.2阿里云安装教程
xiaowei邮件系统，那是企业必备，你可以选择目前市面上已有的各种企业邮箱，如阿里企业邮箱，腾讯企业邮箱 …… 你需要为每一个账户买单费用还不少，当然如果你有技术实力也可以选择使用开源邮件系统进行搭建，主要有 Zimbra，iRedMail , ExtMail….
这其中我喜欢的还是Zimbra，开源免费，随便你建多少用户都可以，功能相当丰富，完美的web端可自适应各种浏览器，方便用户随时查收邮件，除了最基本的邮件收发，额外的一些功能更是外企必备，特别是日历功能，不像其他邮箱的日历也就是本地日历自己玩，Zimbra的日历是和Gmail， Yahoo 等日历是一样的可分享给其他人，外企必备啊，主要外国人喜欢用日历。此外，还有Zimlet类似于一些插件，可以通过插件丰富你的邮件系统。
iRedMail 和 ExtMail以前用过，也还可以，但当时个人感觉还是有些局限，不知道现在怎么样，所以我还是推荐Zimbra。
Zimbra有两个版本，一个是NETWORK EDITION网络版，像企业邮箱一样，你付钱使用就可以了，另一个就是OPEN SOURCE开源版，开源免费随便用。
接下来介绍如何在阿里云的服务器上搭建起属于我们自己的邮件系统。
环境：
地域：香港
系统：CentOS7.7 64位
公网IP：47.52.194.54
内网IP：172.16.12.249
域名：mail.chenxie.net
Zimbra 版本：Zimbra-8.8.15
Zimbra下载地址：https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.RHEL7_64.20190918004220.tgz
一、准备工作
1. 开放以下端口：
80, 443, 25, 110, 143, 465, 995, 993, 587, 7025, 8443, 7071
由于是在阿里云上，所以请前往安全组开启以上端口:
2. 配置主机名
[root@iZ2ze1mxb0c9j7l4rr6oxkZ ~]# echo 'mail.chenxie.net' > /etc/hostname
3. 配置hosts
注意：172.16.12.249是服务器的内网地址
[root@iZ2ze1mxb0c9j7l4rr6oxkZ ~]# echo '172.16.12.249 mail.chenxie.net mail' >> /etc/hosts
4. 检查并停止sendmail和postfix，如果服务器上有的话
# systemctl stop sendmail # systemctl disable sendmail # systemctl stop postfix # systemctl disable postfix
5. 重启系统，确保都生效了
reboot
二、安装dnsmasq
1. 安装dnsmasq
[root@mail ~]# yum install -y dnsmasq bind-utils
2. 配置dnsmasq
vim /etc/dnsmasq.conf
添加以下到文件末尾：
server=127.0.0.1 domain=chenxie.net mx-host=chenxie.net,mail.chenxie.net,5
3. 修改本地dns服务器
vim /etc/resolv.conf
添加以下到文件首行：
nameserver 127.0.0.1
4. 启动dnsmasq
[root@mail ~]# systemctl start dnsmasq
5. 测试
[root@mail ~]# dig MX chenxie.net ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-9.P2.el7 <<>> MX chenxie.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52611 ;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;chenxie.net. IN MX ;; ANSWER SECTION: chenxie.net. 0 IN MX 5 mail.chenxie.net. ;; ADDITIONAL SECTION: mail.chenxie.net. 0 IN A 172.16.12.249 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Nov 28 21:07:17 CST 2019 ;; MSG SIZE rcvd: 88
可以看到A记录mail.chenxie.net 成功解析到IP 172.16.12.249 以及 MX 记录 chenxie.net 成功解析到 mail.chenxie.net
三、安装Zimbra
安装过程如下：
[root@mail ~]# cd /tmp/
[root@mail tmp]# wget https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.RHEL7_64.20190918004220.tgz <--下载Zimbra软件包
[root@mail tmp]# tar -zxf zcs-8.8.15_GA_3869.RHEL7_64.20190918004220.tgz
[root@mail tmp]# cd zcs-8.8.15_GA_3869.RHEL7_64.20190918004220
[root@mail zcs-8.8.15_GA_3869.RHEL7_64.20190918004220]# ll
total 44
drwxr-xr-x 2 503 503 4096 Sep 17 13:55 bin
drwxr-xr-x 2 503 503 4096 Sep 17 13:55 data
drwxr-xr-x 3 503 503 4096 Sep 17 13:55 docs
-rwxr-xr-x 1 503 503 8873 Sep 17 13:55 install.sh
drwxr-xr-x 3 503 503 4096 Sep 17 13:55 lib
drwxr-xr-x 2 503 503 4096 Oct 3 15:45 packages
-rw-r--r-- 1 503 503 369 Sep 17 13:55 readme_binary_en_US.txt
-rw-r--r-- 1 503 503 428 Sep 17 13:55 README.txt
drwxr-xr-x 3 503 503 4096 Sep 17 13:55 util
[root@mail zcs-8.8.15_GA_3869.RHEL7_64.20190918004220]# ./install.sh <--开始安装
Operations logged to /tmp/install.log.YKo3dKuj
Checking for existing installation...
zimbra-drive...NOT FOUND
zimbra-imapd...NOT FOUND
zimbra-patch...NOT FOUND
zimbra-mta-patch...NOT FOUND
zimbra-proxy-patch...NOT FOUND
zimbra-license-tools...NOT FOUND
zimbra-license-extension...NOT FOUND
zimbra-network-store...NOT FOUND
zimbra-network-modules-ng...NOT FOUND
zimbra-chat...NOT FOUND
zimbra-talk...NOT FOUND
zimbra-ldap...NOT FOUND
zimbra-logger...NOT FOUND
zimbra-mta...NOT FOUND
zimbra-dnscache...NOT FOUND
zimbra-snmp...NOT FOUND
zimbra-store...NOT FOUND
zimbra-apache...NOT FOUND
zimbra-spell...NOT FOUND
zimbra-convertd...NOT FOUND
zimbra-memcached...NOT FOUND
zimbra-proxy...NOT FOUND
zimbra-archiving...NOT FOUND
zimbra-core...NOT FOUND
----------------------------------------------------------------------
PLEASE READ THIS AGREEMENT CAREFULLY BEFORE USING THE SOFTWARE.
SYNACOR, INC. ("SYNACOR") WILL ONLY LICENSE THIS SOFTWARE TO YOU IF YOU
FIRST ACCEPT THE TERMS OF THIS AGREEMENT. BY DOWNLOADING OR INSTALLING
THE SOFTWARE, OR USING THE PRODUCT, YOU ARE CONSENTING TO BE BOUND BY
THIS AGREEMENT. IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS
AGREEMENT, THEN DO NOT DOWNLOAD, INSTALL OR USE THE PRODUCT.
License Terms for this Zimbra Collaboration Suite Software:
https://www.zimbra.com/license/zimbra-public-eula-2-6.html
----------------------------------------------------------------------
Do you agree with the terms of the software license agreement? [N] y
Use Zimbra''s package repository [Y] y
Importing Zimbra GPG key
Configuring package repository
Checking for installable packages
Found zimbra-core (local)
Found zimbra-ldap (local)
Found zimbra-logger (local)
Found zimbra-mta (local)
Found zimbra-dnscache (local)
Found zimbra-snmp (local)
Found zimbra-store (local)
Found zimbra-apache (local)
Found zimbra-spell (local)
Found zimbra-memcached (repo)
Found zimbra-proxy (local)
Found zimbra-drive (repo)
Found zimbra-imapd (local)
Found zimbra-patch (repo)
Found zimbra-mta-patch (repo)
Found zimbra-proxy-patch (repo)
Select the packages to install
Install zimbra-ldap [Y] y
Install zimbra-logger [Y] y
Install zimbra-mta [Y] y
Install zimbra-dnscache [Y] y
Install zimbra-snmp [Y] y
Install zimbra-store [Y] y
Install zimbra-apache [Y] y
Install zimbra-spell [Y] y
Install zimbra-memcached [Y] y
Install zimbra-proxy [Y] y
Install zimbra-drive [Y] y
Install zimbra-imapd (BETA - for evaluation only) [N] y
Install zimbra-chat [Y] y
Checking required space for zimbra-core
Checking space for zimbra-store
Checking required packages for zimbra-store
zimbra-store package check complete.
Installing:
zimbra-core
zimbra-ldap
zimbra-logger
zimbra-mta
zimbra-dnscache
zimbra-snmp
zimbra-store
zimbra-apache
zimbra-spell
zimbra-memcached
zimbra-proxy
zimbra-drive
zimbra-imapd
zimbra-patch
zimbra-mta-patch
zimbra-proxy-patch
zimbra-chat
The system will be modified. Continue? [N] y
Beginning Installation - see /tmp/install.log.YKo3dKuj for details...
zimbra-core-components will be downloaded and installed.
zimbra-timezone-data will be installed.
zimbra-common-core-jar will be installed.
zimbra-common-mbox-conf will be installed.
zimbra-common-mbox-conf-attrs will be installed.
zimbra-common-mbox-conf-msgs will be installed.
zimbra-common-mbox-conf-rights will be installed.
zimbra-common-mbox-db will be installed.
zimbra-common-mbox-docs will be installed.
zimbra-common-mbox-native-lib will be installed.
zimbra-common-core-libs will be installed.
zimbra-core will be installed.
zimbra-ldap-components will be downloaded and installed.
zimbra-ldap will be installed.
zimbra-logger will be installed.
zimbra-mta-components will be downloaded and installed.
zimbra-mta will be installed.
zimbra-dnscache-components will be downloaded and installed.
zimbra-dnscache will be installed.
zimbra-snmp-components will be downloaded and installed.
zimbra-snmp will be installed.
zimbra-store-components will be downloaded and installed.
zimbra-jetty-distribution will be downloaded and installed.
zimbra-mbox-conf will be installed.
zimbra-mbox-war will be installed.
zimbra-mbox-service will be installed.
zimbra-mbox-webclient-war will be installed.
zimbra-mbox-admin-console-war will be installed.
zimbra-mbox-store-libs will be installed.
zimbra-store will be installed.
zimbra-apache-components will be downloaded and installed.
zimbra-apache will be installed.
zimbra-spell-components will be downloaded and installed.
zimbra-spell will be installed.
zimbra-memcached will be downloaded and installed.
zimbra-proxy-components will be downloaded and installed.
zimbra-proxy will be installed.
zimbra-drive will be downloaded and installed (later).
zimbra-imapd will be installed.
zimbra-patch will be downloaded and installed (later).
zimbra-mta-patch will be downloaded and installed (later).
zimbra-proxy-patch will be downloaded and installed (later).
zimbra-chat will be downloaded and installed (later).
Downloading packages (11):
zimbra-core-components
zimbra-ldap-components
zimbra-mta-components
zimbra-dnscache-components
zimbra-snmp-components
zimbra-store-components
zimbra-jetty-distribution
zimbra-apache-components
zimbra-spell-components
zimbra-memcached
zimbra-proxy-components
...done
Removing /opt/zimbra
Removing zimbra crontab entry...done.
Cleaning up zimbra init scripts...done.
Cleaning up /etc/security/limits.conf...done.
Finished removing Zimbra Collaboration Server.
Installing repo packages (11):
zimbra-core-components
zimbra-ldap-components
zimbra-mta-components
zimbra-dnscache-components
zimbra-snmp-components
zimbra-store-components
zimbra-jetty-distribution
zimbra-apache-components
zimbra-spell-components
zimbra-memcached
zimbra-proxy-components
...done
Installing local packages (27):
zimbra-timezone-data
zimbra-common-core-jar
zimbra-common-mbox-conf
zimbra-common-mbox-conf-attrs
zimbra-common-mbox-conf-msgs
zimbra-common-mbox-conf-rights
zimbra-common-mbox-db
zimbra-common-mbox-docs
zimbra-common-mbox-native-lib
zimbra-common-core-libs
zimbra-core
zimbra-ldap
zimbra-logger
zimbra-mta
zimbra-dnscache
zimbra-snmp
zimbra-mbox-conf
zimbra-mbox-war
zimbra-mbox-service
zimbra-mbox-webclient-war
zimbra-mbox-admin-console-war
zimbra-mbox-store-libs
zimbra-store
zimbra-apache
zimbra-spell
zimbra-proxy
zimbra-imapd
...done
Installing extra packages (5):
zimbra-drive
zimbra-patch
zimbra-mta-patch
zimbra-proxy-patch
zimbra-chat
...done
Running Post Installation Configuration:
Operations logged to /tmp/zmsetup.20191128-211310.log
Installing LDAP configuration database...done.
Setting defaults...
DNS ERROR resolving MX for mail.chenxie.net
It is suggested that the domain name have an MX record configured in DNS
Change domain name? [Yes] yes <--yes同意
Create domain: [mail.chenxie.net] chenxie.net <--要求输入有MX记录的域名，输入chenxie.net
MX: mail.chenxie.net (172.16.12.249)
Interface: 127.0.0.1
Interface: 172.16.12.249
done.
Checking for port conflicts
Port conflict detected: 53 (zimbra-dnscache)
Port conflict detected: 53 (zimbra-dnscache)
Port conflicts detected! - Press Enter/Return key to continue
Main menu
1) Common Configuration:
2) zimbra-ldap: Enabled
3) zimbra-logger: Enabled
4) zimbra-mta: Enabled
5) zimbra-dnscache: Enabled
6) zimbra-snmp: Enabled
7) zimbra-store: Enabled
+Create Admin User: yes
+Admin user to create: admin@chenxie.net
******* +Admin Password UNSET
+Anti-virus quarantine user: virus-quarantine.zc2g14ji@chenxie.net
+Enable automated spam training: yes
+Spam training user: spam.tsm0pkqpq@chenxie.net
+Non-spam(Ham) training user: ham.kbsf7h9cf@chenxie.net
+SMTP host: mail.chenxie.net
+Web server HTTP port: 8080
+Web server HTTPS port: 8443
+Web server mode: https
+IMAP server port: 7143
+IMAP server SSL port: 7993
+POP server port: 7110
+POP server SSL port: 7995
+Use spell check server: yes
+Spell server URL: http://mail.chenxie.net:7780/aspell.php
+Enable version update checks: TRUE
+Enable version update notifications: TRUE
+Version update notification email: admin@chenxie.net
+Version update source email: admin@chenxie.net
+Install mailstore (service webapp): yes
+Install UI (zimbra,zimbraAdmin webapps): yes
8) zimbra-spell: Enabled
9) zimbra-proxy: Enabled
10) zimbra-imapd: Enabled
11) Default Class of Service Configuration:
s) Save config to file
x) Expand menu
q) Quit
Address unconfigured (**) items (? - help) 7 <--管理员密码没有设置，按7进入管理员设置菜单
Store configuration
1) Status: Enabled
2) Create Admin User: yes
3) Admin user to create: admin@chenxie.net
** 4) Admin Password UNSET
5) Anti-virus quarantine user: virus-quarantine.zc2g14ji@chenxie.net
6) Enable automated spam training: yes
7) Spam training user: spam.tsm0pkqpq@chenxie.net
8) Non-spam(Ham) training user: ham.kbsf7h9cf@chenxie.net
9) SMTP host: mail.chenxie.net
10) Web server HTTP port: 8080
11) Web server HTTPS port: 8443
12) Web server mode: https
13) IMAP server port: 7143
14) IMAP server SSL port: 7993
15) POP server port: 7110
16) POP server SSL port: 7995
17) Use spell check server: yes
18) Spell server URL: http://mail.chenxie.net:7780/aspell.php
19) Enable version update checks: TRUE
20) Enable version update notifications: TRUE
21) Version update notification email: admin@chenxie.net
22) Version update source email: admin@chenxie.net
23) Install mailstore (service webapp): yes
24) Install UI (zimbra,zimbraAdmin webapps): yes
Select, or 'r' for previous menu [r] 4 <--按4设置管理员密码
Password for admin@chenxie.net (min 6 characters): [XODMeCq7] 123678 <--我这里设置管理员密码为 123678
Store configuration
1) Status: Enabled
2) Create Admin User: yes
3) Admin user to create: admin@chenxie.net
4) Admin Password set
5) Anti-virus quarantine user: virus-quarantine.zc2g14ji@chenxie.net
6) Enable automated spam training: yes
7) Spam training user: spam.tsm0pkqpq@chenxie.net
8) Non-spam(Ham) training user: ham.kbsf7h9cf@chenxie.net
9) SMTP host: mail.chenxie.net
10) Web server HTTP port: 8080
11) Web server HTTPS port: 8443
12) Web server mode: https
13) IMAP server port: 7143
14) IMAP server SSL port: 7993
15) POP server port: 7110
16) POP server SSL port: 7995
17) Use spell check server: yes
18) Spell server URL: http://mail.chenxie.net:7780/aspell.php
19) Enable version update checks: TRUE
20) Enable version update notifications: TRUE
21) Version update notification email: admin@chenxie.net
22) Version update source email: admin@chenxie.net
23) Install mailstore (service webapp): yes
24) Install UI (zimbra,zimbraAdmin webapps): yes
Select, or 'r' for previous menu [r] r <--设置完成，按r返回上级菜单
Main menu
1) Common Configuration:
2) zimbra-ldap: Enabled
3) zimbra-logger: Enabled
4) zimbra-mta: Enabled
5) zimbra-dnscache: Enabled
6) zimbra-snmp: Enabled
7) zimbra-store: Enabled
8) zimbra-spell: Enabled
9) zimbra-proxy: Enabled
10) zimbra-imapd: Enabled
11) Default Class of Service Configuration:
s) Save config to file
x) Expand menu
q) Quit
*** CONFIGURATION COMPLETE - press 'a' to apply
Select from menu, or press 'a' to apply config (? - help) a <--按a应用设置
Save configuration data to a file? [Yes] yes <--yes保存配置到文件
Save config in file: [/opt/zimbra/config.8030] <--直接回车，保存到配置到文件/opt/zimbra/config.8030
Saving config in /opt/zimbra/config.8030...done.
The system will be modified - continue? [No] yes <--yes继续安装
Operations logged to /tmp/zmsetup.20191128-211310.log
Setting local config values...done.
Initializing core config...Setting up CA...done.
Deploying CA to /opt/zimbra/conf/ca ...done.
Creating SSL zimbra-imapd certificate...done.
Creating new zimbra-store SSL certificate...done.
Creating new zimbra-ldap SSL certificate...done.
Creating new zimbra-mta SSL certificate...done.
Creating new zimbra-proxy SSL certificate...done.
Installing mailboxd SSL certificates...done.
Installing imapd SSL certificates...done.
Installing MTA SSL certificates...done.
Installing LDAP SSL certificate...done.
Installing Proxy SSL certificate...done.
Initializing ldap...done.
Setting replication password...done.
Setting Postfix password...done.
Setting amavis password...done.
Setting nginx password...done.
Setting BES searcher password...done.
Creating server entry for mail.chenxie.net...done.
Setting Zimbra IP Mode...done.
Saving CA in ldap...done.
Saving SSL Certificate in ldap...done.
Setting spell check URL...done.
Setting service ports on mail.chenxie.net...done.
Setting zimbraFeatureTasksEnabled=TRUE...done.
Setting zimbraFeatureBriefcasesEnabled=TRUE...done.
Checking current setting of zimbraReverseProxyAvailableLookupTargets
Querying LDAP for other mailstores
Searching LDAP for reverseProxyLookupTargets...done.
Adding mail.chenxie.net to zimbraReverseProxyAvailableLookupTargets
Setting Master DNS IP address(es)...done.
Setting DNS cache tcp lookup preference...done.
Setting DNS cache udp lookup preference...done.
Setting DNS tcp upstream preference...done.
Updating zimbraLDAPSchemaVersion to version '1557224584'
Setting TimeZone Preference...done.
Disabling strict server name enforcement on mail.chenxie.net...done.
Initializing mta config...done.
Setting services on mail.chenxie.net...done.
Adding mail.chenxie.net to zimbraMailHostPool in default COS...done.
Creating domain chenxie.net...done.
Setting default domain name...done.
Creating domain chenxie.net...already exists.
Creating admin account admin@chenxie.net...done.
Creating root alias...done.
Creating postmaster alias...done.
Creating user spam.tsm0pkqpq@chenxie.net...done.
Creating user ham.kbsf7h9cf@chenxie.net...done.
Creating user virus-quarantine.zc2g14ji@chenxie.net...done.
Setting spam training and Anti-virus quarantine accounts...done.
Initializing store sql database...done.
Setting zimbraSmtpHostname for mail.chenxie.net...done.
Configuring SNMP...done.
Setting up syslog.conf...done.
Enabling IMAP protocol for zimbra-imapd service...done.
Enabling IMAPS protocol for zimbra-imapd service...done.
Starting servers...done.
Installing common zimlets...
com_zimbra_date...done.
com_zimbra_proxy_config...done.
com_zimbra_mailarchive...done.
com_zimbra_tooltip...done.
com_zimbra_ymemoticons...done.
com_zimbra_phone...done.
com_zimbra_cert_manager...done.
com_zimbra_url...done.
com_zimbra_attachcontacts...done.
com_zimbra_adminversioncheck...done.
com_zimbra_viewmail...done.
com_zimbra_webex...done.
com_zimbra_clientuploader...done.
com_zextras_chat_open...done.
com_zimbra_email...done.
com_zextras_drive_open...done.
com_zimbra_bulkprovision...done.
com_zimbra_srchhighlighter...done.
com_zimbra_attachmail...done.
Finished installing common zimlets.
Restarting mailboxd...done.
Creating galsync account for default domain...done.
You have the option of notifying Zimbra of your installation.
This helps us to track the uptake of the Zimbra Collaboration Server.
The only information that will be transmitted is:
The VERSION of zcs installed (8.8.15_GA_3869_RHEL7_64)
The ADMIN EMAIL ADDRESS created (admin@chenxie.net)
Notify Zimbra of your installation? [Yes] no
Notification skipped
Checking if the NG started running...done.
Setting up zimbra crontab...done.
Moving /tmp/zmsetup.20191128-211310.log to /opt/zimbra/log
Configuration complete - press return to exit
[root@mail zcs-8.8.15_GA_3869.RHEL7_64.20190918004220]#
安装完成。
重要：接下来移除文件 /etc/resolv.conf 第一行的 nameserver 127.0.0.1 然后reboot重启系统。
启动之后查看服务运行状态：
[root@mail ~]# su - zimbra <--切换到zimbra用户下 Last login: Thu Nov 28 21:30:21 CST 2019 on pts/0 [zimbra@mail ~]$ [zimbra@mail ~]$ zmcontrol status <--查看zimbra服务运行状态 Host mail.chenxie.net amavis Running antispam Running antivirus Running dnscache Running imapd Running ldap Running logger Running mailbox Running memcached Running mta Running opendkim Running proxy Running service webapp Running snmp Running spell Running stats Running zimbra webapp Running zimbraAdmin webapp Running zimlet webapp Running zmconfigd Running
全部启动成功。如果有没启动成功的，请等一等再看，启动服务需要时间。
四、配置公网DNS
为了能够正常的在公网上收发邮件，访问我们的邮件系统，我们还需要为邮件服务器配置公网DNS，分别设置一条A记录和MX记录，我这里用的是阿里云的云解析，如下：
设置好后，稍等一会等待生效后即可通过域名访问。
普通用户访问地址为：https://mail.chenxie.net/
管理员访问地址为：https://mail.chenxie.net:7071/
- 管理员用户名：admin
- 管理员密码：即安装时提示你设置的密码，我这里是123678
注意：现在登录还会提示你证书错误，所以我们还需要给服务器配置可信任的证书，这里先忽略这个提示，下一篇文章再继续讲述。
非常重要提示：
我们Zimbra邮件系统已经装好了，但是由于阿里默认禁止25端口出去，也就是你的邮件此时是无法向外发送的，只能接收到其他域给你发来的邮件，所以还需要去阿里云控制台申请25端口解封，能不能解封就看它心情以及你的运气了。
步骤如下：
登录阿里云后 点击头像–>安全管控–>25端口解封，输入你的IP以及关联域名，提交申请。
The End
发布于：2023-01-18，除非注明，否则均为 原创文章，转载请注明出处。
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