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geekpi
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Mosh Shell – A SSH Based Client for Connecting Remote Unix/Linux Systems
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================================================================================
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Mosh, which stands for Mobile Shell is a command-line application which is used for connecting to the server from a client computer, over the Internet. It can be used as SSH and contains more feature than Secure Shell. It is an application similar to SSH, but with additional features. The application is written originally by Keith Winstein for Unix like operating system and released under GNU GPL v3.
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Mosh Shell SSH Client
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#### Features of Mosh ####
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- It is a remote terminal application that supports roaming.
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- Available for all major UNIX-like OS viz., Linux, FreeBSD, Solaris, Mac OS X and Android.
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- Intermittent Connectivity supported.
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- Provides intelligent local echo.
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- Line editing of user keystrokes supported.
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- Responsive design and Robust Nature over wifi, cellular and long-distance links.
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- Remain Connected even when IP changes. It usages UDP in place of TCP (used by SSH). TCP time out when connect is reset or new IP assigned but UDP keeps the connection open.
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- The Connection remains intact when you resume the session after a long time.
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- No network lag. Shows users typed key and deletions immediately without network lag.
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- Same old method to login as it was in SSH.
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- Mechanism to handle packet loss.
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### Installation of Mosh Shell in Linux ###
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On Debian, Ubuntu and Mint alike systems, you can easily install the Mosh package with the help of [apt-get package manager][1] as shown.
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# apt-get update
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# apt-get install mosh
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On RHEL/CentOS/Fedora based distributions, you need to turn on third party repository called [EPEL][2], in order to install mosh from this repository using [yum package manager][3] as shown.
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# yum update
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# yum install mosh
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On Fedora 22+ version, you need to use [dnf package manager][4] to install mosh as shown.
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# dnf install mosh
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### How do I use Mosh Shell? ###
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1. Let’s try to login into remote Linux server using mosh shell.
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$ mosh root@192.168.0.150
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Mosh Shell Remote Connection
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**Note**: Did you see I got an error in connecting since the port was not open in my remote CentOS 7 box. A quick but not recommended solution I performed was:
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# systemctl stop firewalld [on Remote Server]
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The preferred way is to open a port and update firewall rules. And then connect to mosh on a predefined port. For in-depth details on firewalld you may like to visit this post.
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- [How to Configure Firewalld][5]
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2. Let’s assume that the default SSH port 22 was changed to port 70, in this case you can define custom port with the help of ‘-p‘ switch with mosh.
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$ mosh -p 70 root@192.168.0.150
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3. Check the version of installed Mosh.
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$ mosh --version
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Check Mosh Version
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4. You can close mosh session type ‘exit‘ on the prompt.
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$ exit
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5. Mosh supports a lot of options, which you may see as:
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$ mosh --help
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Mosh Shell Options
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#### Cons of Mosh Shell ####
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- Mosh requires additional prerequisite for example, allow direct connection via UDP, which was not required by SSH.
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- Dynamic port allocation in the range of 60000-61000. The first open fort is allocated. It requires one port per connection.
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- Default port allocation is a serious security concern, especially in production.
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- IPv6 connections supported, but roaming on IPv6 not supported.
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- Scrollback not supported.
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- No X11 forwarding supported.
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- No support for ssh-agent forwarding.
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### Conclusion ###
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Mosh is a nice small utility which is available for download in the repository of most of the Linux Distributions. Though it has a few discrepancies specially security concern and additional requirement it’s features like remaining connected even while roaming is its plus point. My recommendation is Every Linux-er who deals with SSH should try this application and mind it, Mosh is worth a try.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/install-mosh-shell-ssh-client-in-linux/
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作者：[Avishek Kumar][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/avishek/
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[1]:http://www.tecmint.com/useful-basic-commands-of-apt-get-and-apt-cache-for-package-management/
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[2]:http://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/
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[3]:http://www.tecmint.com/20-linux-yum-yellowdog-updater-modified-commands-for-package-mangement/
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[4]:http://www.tecmint.com/dnf-commands-for-fedora-rpm-package-management/
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[5]:http://www.tecmint.com/configure-firewalld-in-centos-7/
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mosh - 一个基于SSH用于连接远程Unix/Linux系统的工具
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================================================================================
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Mosh表示移动Shell（Mobile Shell）是一个用于从客户端连接远程服务器的命令行工具。它可以像ssh那样使用并包含了更多的功能。它是一个类似ssh的程序，但是提供更多的功能。程序最初由Keith Winstein编写用于类Unix的操作系统中，发布于GNU GPL v3协议下。
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Mosh客户端
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#### Mosh的功能 ####
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- 它是一个支持漫游的远程终端程序。
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- 在所有主流类Unix版本中可用如Linux、FreeBSD、Solaris、Mac OS X和Android。
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- 中断连接支持
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- 支持智能本地echo
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- 用户按键行编辑支持
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- 响应式设计及在wifi、3G、长距离连接下的鲁棒性
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- 在IP改变后保持连接。它使用UDP代替TCP（在SSH中使用）当连接被重置或者获得新的IP后TCP会超时但是UDP仍然保持连接。
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- 在你很长之间之后恢复会话时仍然保持连接。
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- 没有网络延迟。立即显示用户输入和删除而没有延迟
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- 像SSH那样支持一些旧的方式登录。
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- 包丢失处理机制
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### Linux中mosh的安装 ###
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在Debian、Ubuntu和Mint类似的系统中，你可以很容易地用[apt-get包管理器][1]安装。
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# apt-get update
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# apt-get install mosh
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在基于RHEL/CentOS/Fedora的系统中，要使用[yum 包管理器][3]安装mosh，你需要打开第三方的[EPEL][2]。
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# yum update
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# yum install mosh
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在Fedora 22+的版本中，你需要使用[dnf包管理器][4]来安装mosh。
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# dnf install mosh
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### 我该如何使用mosh？ ###
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1. 让我们尝试使用mosh登录远程Linux服务器。
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$ mosh root@192.168.0.150
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mosh远程连接
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**注意**：你有没有看到一个连接错误，因为我在CentOS 7中还有打开这个端口。一个快速但是我并不建议的解决方法是：
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# systemctl stop firewalld [on Remote Server]
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更好的方法是打开一个端口并更新防火墙规则。接着用mosh连接到预定义的端口中。至于更深入的细节，也许你会对下面的文章感兴趣。
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- [如何配置Firewalld][5]
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2. 让我们假设把默认的22端口改到70，这时使用-p选项来使用自定义端口。
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$ mosh -p 70 root@192.168.0.150
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3. 检查mosh的版本
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$ mosh --version
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检查mosh版本
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4. 你可以输入‘exit’来退出mosh会话。
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$ exit
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5. mosh支持很多选项，你可以用下面的方法看到：
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$ mosh --help
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Mosh选项
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#### mosh的利弊 ####
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- mosh有额外的需求，比如需要允许UDP直接连接，这在SSH不需要。
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- 动态分配的端口范围是60000-61000。第一个打开的端口是分配的。每个连接都需要一个端口。
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- 默认端口分配是一个严重的安全问题，尤其是在生产环境中。
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- 支持IPv6连接，但是不支持IPv6漫游。
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- 不支持回溯
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- 不支持X11转发
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- 不支持ssh-agent转发
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### 总结 ###
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Mosh is a nice small utility which is available for download in the repository of most of the Linux Distributions. Though it has a few discrepancies specially security concern and additional requirement it’s features like remaining connected even while roaming is its plus point. My recommendation is Every Linux-er who deals with SSH should try this application and mind it, Mosh is worth a try.
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mosh是一款在大多数linux发行版的仓库中可以下载的一款小工具。虽然它有一些差异尤其是安全问题和额外的需求，它的功能像漫游后保持连接是一个加分点。我的建议是任何一个使用ssh的linux用户都应该试试这个程序，mosh值得一试
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/install-mosh-shell-ssh-client-in-linux/
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作者：[Avishek Kumar][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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||||
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/avishek/
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[1]:http://www.tecmint.com/useful-basic-commands-of-apt-get-and-apt-cache-for-package-management/
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||||
[2]:http://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/
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||||
[3]:http://www.tecmint.com/20-linux-yum-yellowdog-updater-modified-commands-for-package-mangement/
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[4]:http://www.tecmint.com/dnf-commands-for-fedora-rpm-package-management/
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[5]:http://www.tecmint.com/configure-firewalld-in-centos-7/
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