- 1DNS caching service (dnscache)
- 1.2How to enable it
- Zimbra Install Port Conflict Detected 250
- Zimbra Install Port Conflict Detected 25 3
- Zimbra Install Port Conflict Detected 25 2017
- Zimbra Install Port Conflict Detected 25 In 1
- Zimbra Install Port Conflict Detected 25 Free
KB 21979 | Last updated on 2019-03-20 | Last updated by Phoenix | (0 votes) | Verified in: ZCS 8.8ZCS 8.7ZCS 8.6 | |
- This is certified documentation and is protected for editing by Zimbra Employees & Moderators only. |
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. The previous configuration appears to have failed to complete. Attempt to complete configuration now? yes Save configuration data to a file? As zimbra uses ports 80,443,110,25 and others you cannot use any of those ports for your existing application (web server, email server) if you want to install zimbra on same machine. Its always best to install zimbra on separate server of its own with no other services running. During the Zimbra Collaboration installation, Zimbra makes global system changes that may break applications that are on your server. Installation Prerequisites. In order to successfully install and run Zimbra Collaboration, ensure your system meets the requirements described in this section.
KB 21979 | Last updated on 2019-03-20 | |
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(0 votes) | ||
- This is certified documentation and is protected for editing by Zimbra Employees & Moderators only. |
Starting with Zimbra Collaboration 8.5 and above, there is now a DNS caching service available for installation. It is specifically targeted for MTA nodes, and could be perfect for Single-Server Installations. Three of our supported features rely heavily on DNS lookups:
- DKIM verification
- SpamAssassin Scoring
- Postfix RBLs for spam blocking
However, remote sites that provide the SpamAssassin scoring and Postfix RBLs do *not* like heavy DNS traffic overloading their servers as DNS-Blocklists often run on the 'free for some' model and/or they may limit the number of queries you can perform to maximize resources. Prolonged over-use of their DNS systems will in fact get your MTAs blacklisted from using those services, severely reducing the effectiveness of said services.
How it works
dnscache adds into the MTA servers a local DNS cache server that can keep all the external DNS request, using it the MTA server only need to ask one time to obtain the DNS info of the external domains, and the next times instead ask the Public DNS, the MTA will ask itself saving bandwidth and keep the MTA out of be blacklisted for high DNS request traffic.
How to enable it
To ensure you do not have your MTAs blacklisted the DNS caching package is now part of Zimbra Collaboration. General setup:
The installer will automatically reconfigure the DNS cache as the primary resolver for the OS.
If you didn't select any DNS server IP, the dnscache will use the Google DNS by default (8.8.8.8)
You can start, stop, restart, reload or see the status using the next command like Zimbra user:
NOTE: SHOULD NOT BE INSTALLED ON SYSTEMS THAT ALREADY HAVE BIND OR OTHER DNS SERVICES INSTALLED. Instead, the client should configure such servers to also act as a DNS cache.
Check the DNSMasterIP
You can check the DNSMasterIP that your dnscache is using, you can have more than one:
Add a DNSMasterIP
You can also add more DNSMasterIP anytime if you need it, in case that you add some new internal DNS Server, or if you want to have more than the Google ones, for example:
Remove a DNSMasterIP
Zimbra Install Port Conflict Detected 250
If you want to remove a DNSMasterIP that was introduced wrong, or because the DNS server is not longer available, etc, run the next command:
Testing the DNS caching service (dnscache)
For example, let's try to make a DNS request about mail.google.com:First time once request the DNS, is taking 62ms because the MTA asks the dnscache, and the dnscache ask the public DNS:
Second time once request the DNS, is taking 0ms because the MTA asks the dnscache, and the dnscache have the info already cached, using 0ms not latency, neither bandwidth:
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Additonal Content
- See the Bug 83670 related to this new Feature.
- Want to read more about DNSBlocklists, or how you can have troubles without dnscache? - https://wiki.apache.org/spamassassin/DnsBlocklists
- Using the Config Guide, Zimbra Collaboration added some new attributes for the DNS caching Service:
ID | Name | Type | Since | Description |
---|---|---|---|---|
1569 | zimbraDNSMasterIP | string | 8.5.0 | IP Address(es) of the root DNS servers to be used by the DNS cache service |
1584 | zimbraDNSUseTCP | enum | 8.5.0 | For zimbra dnscache, whether or not to use TCP. Defaults to yes |
1586 | zimbraDNSUseUDP | enum | 8.5.0 | For zimbra dnscache, whether or not to use UDP. Defaults to yes |
1597 | zimbraDNSTCPUpstream | enum | 8.5.0 | For zimbra dnscache, whether or not to only use TCP when talking to the upstream Master DNS servers. Defaults to no |
Identified Support Issues
- No Support issues reported yet.
Verified Against: Zimbra Collaboration Suite 8.5 | Date Created: 08/04/2014 |
Article ID:https://wiki.zimbra.com/index.php?title=DNS_caching_service_(dnscache) | Date Modified: 2019-03-20 |
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Wiki/KB reviewed by | SME1 | SME2 | Copyeditor | Last edit by Phoenix |
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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。
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 Install Port Conflict Detected 25 3
Zimbra下载地址:https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.RHEL7_64.20190918004220.tgz
1. 开放以下端口:
由于是在阿里云上,所以请前往安全组开启以上端口:
Zimbra Install Port Conflict Detected 25 2017
2. 配置主机名
3. 配置hosts
注意:172.16.12.249是服务器的内网地址
4. 检查并停止sendmail和postfix,如果服务器上有的话
5. 重启系统,确保都生效了
Zimbra Install Port Conflict Detected 25 In 1
1. 安装dnsmasq
2. 配置dnsmasq
vim /etc/dnsmasq.conf
添加以下到文件末尾:
3. 修改本地dns服务器
vim /etc/resolv.conf
添加以下到文件首行:
4. 启动dnsmasq
5. 测试
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
安装过程如下:
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:
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。
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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:
Zimbra Install Port Conflict Detected 25 Free
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。