安装服务的时候报错，自动停止
报错内容如下：

Total download size: 44 M
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
Stderr: warning: /var/cache/yum/x86_64/7/epel/packages/jq-1.6-2.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 352c64e5: NOKEY
Importing GPG key 0x352C64E5:
 Userid     : "Fedora EPEL (7) <epel@fedoraproject.org>"
 Fingerprint: 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5
 From       : http://mirrors.cloud.tencent.com/epel/RPM-GPG-KEY-EPEL-7

翻译了下报错为：增量RPM已禁用，因为未安装/usr/bin/applydeltarpm。

那么安装它就可以了

[root@b install]# yum provides '*/applydeltarpm'
# provides查找applydeltarpm安装包
Loaded plugins: fastestmirror
Repository cr is listed more than once in the configuration
Repository fasttrack is listed more than once in the configuration
Loading mirror speeds from cached hostfile
epel/7/x86_64/filelists_db                                                                                    |  12 MB  00:00:45     
extras/7/x86_64/filelists_db                                                                                  | 231 kB  00:00:00     
deltarpm-3.6-3.el7.x86_64 : Create deltas between rpms
Repo        : os
Matched from:
Filename    : /usr/bin/applydeltarpm

# 安装找到的包：deltarpm-3.6-3.el7.x86_64
yum -y install deltarpm-3.6-3.el7.x86_64

重新执行安装服务命令，服务安装成功，错误解决