今天修补一下zabbix-server，突然出现问题如下。
[root@chaofeng yum.repos.d]#dnf install zabbix-server-mysql --releasever 7
Last metadata expiration check: 0:00:17 ago on Thu 04 Jun 2020 08:20:03 AM CST.
Error:
Problem: conflicting requests
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.0-2.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.1-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.10-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.11-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.12-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.13-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.14-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.15-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.16-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.17-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.17-2.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.18-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.19-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.2-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.20-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.21-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.21-2.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.3-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.4-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.5-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.6-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.7-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.8-1.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.9-2.el7.x86_64
- nothing provides libiksemel.so.3()(64bit) needed by zabbix-server-mysql-4.0.9-3.el7.x86_64
实在是坑爹，应该是不小心删除了/var/lib/yum导致的，环境出现了依赖问题，。因此需要修复一下。报错就是上面的这些，按照其他的网友的方法都试过了，比如后面加上--releasever=7，指定当前系统的版本都不行。看来只能自己就自己了，既然说缺少这个库，那就下载libiksemel这个名字的库。
链接地址就是：http://springdale.math.ias.edu/data/puias/unsupported/7/x86_64/iksemel-1.4-6.sdl7.x86_64.rpm，下载下来之后，使用
[root@chaofeng ~]#yum install iksemel-1.4-6.sdl7.x86_64.rpm
Unable to detect release version (use '--releasever' to specify release version)
Last metadata expiration check: 0:05:30 ago on Thu 04 Jun 2020 08:20:03 AM CST.
Dependencies resolved.
===================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================
Installing:
iksemel x86_64 1.4-6.sdl7 @commandline 51 k
Installing dependencies:
acl x86_64 2.2.51-15.el7 base 81 k
audit-libs x86_64 2.8.5-4.el7 base 102 k
basesystem noarch 10.0-7.el7.centos base 5.0 k
bash x86_64 4.2.46-34.el7 base 1.0 M
省略省略
ncurses-5.9-14.20130511.el7_4.x86_64 ncurses-base-5.9-14.20130511.el7_4.noarch ncurses-libs-5.9-14.20130511.el7_4.x86_64
nettle-2.7.1-8.el7.x86_64 nspr-4.21.0-1.el7.x86_64 nss-3.44.0-7.el7_7.x86_64
nss-pem-1.0.3-7.el7.x86_64 nss-softokn-3.44.0-8.el7_7.x86_64 nss-softokn-freebl-3.44.0-8.el7_7.x86_64
nss-sysinit-3.44.0-7.el7_7.x86_64 nss-tools-3.44.0-7.el7_7.x86_64 nss-util-3.44.0-4.el7_7.x86_64
openldap-2.4.44-21.el7_6.x86_64 openssl-libs-1:1.0.2k-19.el7.x86_64 p11-kit-0.23.5-3.el7.x86_64
p11-kit-trust-0.23.5-3.el7.x86_64 pam-1.1.8-23.el7.x86_64 pcre-8.32-17.el7.x86_64
pkgconfig-1:0.27.1-4.el7.x86_64 popt-1.13-16.el7.x86_64 procps-ng-3.3.10-27.el7.x86_64
qrencode-libs-3.4.1-3.el7.x86_64 readline-6.2-11.el7.x86_64 rpm-4.11.3-43.el7.x86_64
rpm-libs-4.11.3-43.el7.x86_64 sed-4.2.2-6.el7.x86_64 setup-2.8.71-11.el7.noarch
shadow-utils-2:4.6-5.el7.x86_64 shared-mime-info-1.8-5.el7.x86_64 sqlite-3.7.17-8.el7_7.1.x86_64
tar-2:1.26-35.el7.x86_64 trousers-0.3.14-2.el7.x86_64 ustr-1.0.4-16.el7.x86_64
util-linux-2.23.2-63.el7.x86_64 xz-5.2.2-1.el7.x86_64 xz-libs-5.2.2-1.el7.x86_64
zlib-1.2.7-18.el7.x86_64 binutils-2.27-43.base.el7_8.1.x86_64 device-mapper-7:1.02.164-7.el7_8.2.x86_64
device-mapper-libs-7:1.02.164-7.el7_8.2.x86_64 systemd-219-73.el7_8.6.x86_64 systemd-libs-219-73.el7_8.6.x86_64
tzdata-2020a-1.el7.noarch
Complete!
的方式让系统自动解决依赖问题安装这个包，会比较大，所以耐心等待即可。
然后再安装zabbix-server，就没有任何问题了。--releasever=7都不指定了。