本文介绍如何在CentOS 7操作系统中安装Snapd的方法，文末附上运行snap –help命令返回的内容。
具体方法
1、首先安装COPR插件和EPEL，通过添加epel存储库并安装copr yum插件来启动安装，运行如下命令：
sudo yum install epel-release
sudo yum install yum-plugin-copr
2、然后添加repo：
$ sudo yum copr enable ngompa/snapcore-el7
Loaded plugins: copr, fastestmirror
You are about to enable a Copr repository. Please note that this repository is not part of the main Fedora distribution, and quality may vary.
The Fedora Project does not exercise any power over the contents of this repository beyond the rules outlined in the Copr FAQ at
<https://fedorahosted.org/copr/wiki/UserDocs#WhatIcanbuildinCopr>, and packages are not held to any quality or securty level.
Please do not file bug reports about these packages in Fedora Bugzilla. In case of problems, contact the owner of this repository.
Do you want to continue? [y/N]: y
copr done
3、添加存储库后，安装snapd软件包，运行以下命令：
sudo yum -y install snapd
4、等待安装完成后启用snapd socket：
$ sudo systemctl enable –now snapd.socket
Created symlink from /etc/systemd/system/sockets.target.wants/snapd.socket to /usr/lib/systemd/system/snapd.socket.
5、限制需要从/snap到/var/lib/snapd/snap下的/snap或符号链接下的snaps，为它创建一个符号链接，如下命令：
sudo ln -s /var/lib/snapd/snap /snap
做到这里，Snapd已经安装完成了。
附：snap用法及参数（英文）
# snap –help
用法:snap [OPTIONS] <command>
Install, configure, refresh and remove snap packages. Snaps are ‘universal’ packages that work across many different Linux systems,enabling secure distribution of the latest apps and utilities for cloud, servers, desktops and the internet of things.
This is the CLI for snapd, a background service that takes care of snaps on the system. Start with ‘snap list’ to see installed snaps.
应用选项:
–version——打印版本并退出
帮助选项:
-h, –help——显示此帮助消息
可用的命令:
abort——中止待定更改
ack——Adds an assertion to the system
alias——Sets up a manual alias
aliases——Lists aliases in the system
buy——Buys a snap
changes——List system changes
connect——Connects a plug to a slot
disable——Disables a snap in the system
disconnect——Disconnects a plug from a slot
download——Downloads the given snap
enable——Enables a snap in the system
find——Finds packages to install (aliases: search)
get——Prints configuration options
help——帮助
info——show detailed information about a snap
install——Installs a snap to the system
interface——Lists snap interfaces
interfaces——Lists interfaces in the system
known——Shows known assertions of the provided type
list——List installed snaps
login——Authenticates on snapd and the store
logout——Log out of the store
logs——Retrieve logs of services
pack——pack the given target dir as a snap
prefer——Prefer aliases from a snap and disable conflicts
refresh——Refreshes a snap in the system
remove——Removes a snap from the system
restart——Restart services
revert——Reverts the given snap to the previous state
run——Run the given snap command
services——Query the status of services
set——Changes configuration options
start——Start services
stop——Stop services
switch——Switches snap to a different channel
tasks——List a change’s tasks (aliases: change)
try——Tests a snap in the system
unalias——Unalias a manual alias or an entire snap
version ——Shows version details
watch——Watch a change in progress
whoami——Prints the email the user is logged in with.
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