mysqldインストールエラー

Question

OSはAmazon Linux AMI release 2018.03になります。

https://qiita.com/yut-nagase/items/780d68a15b05c50c0a42

上記リンクより、mysqldをインストールを行ったところ、下記ログより、エラーとなってしまいました。
こちらはどのように対応すればよろしいでしょうか？

yum install --skip-broken mysql-community-server
など実行してみましたがいまいち対応が分からない状態であります。

また、
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
上記二つはどのような意味でしょうか？

よろしくお願い致します。

[root@ip-172-16-38-207 SageMaker]# rpm -ivh http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
Retrieving http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
warning: /var/tmp/rpm-tmp.k4LXvs: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql57-community-release-el7-8  ################################# [100%]
[root@ip-172-16-38-207 SageMaker]# 
[root@ip-172-16-38-207 SageMaker]# yum install mysql-community-server
Loaded plugins: dkms-build-requires, priorities, update-motd, upgrade-helper, versionlock
29 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 5.7.28-1.el7 for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 5.7.9 for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-64) >= 5.7.9 for package: mysql-community-client-5.7.28-1.el7.x86_64
---> Package mysql-community-common.x86_64 0:5.7.28-1.el7 will be installed
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-libs.x86_64 0:5.7.28-1.el7 will be installed
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Finished Dependency Resolution
Error: Package: mysql-community-server-5.7.28-1.el7.x86_64 (mysql57-community)
           Requires: systemd
Error: Package: mysql-community-server-5.7.28-1.el7.x86_64 (mysql57-community)
           Requires: libsasl2.so.3()(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest
[root@ip-172-16-38-207 SageMaker]# 
[root@ip-172-16-38-207 SageMaker]# yum install --skip-broken mysql-community-server
Loaded plugins: dkms-build-requires, priorities, update-motd, upgrade-helper, versionlock
29 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 5.7.28-1.el7 for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 5.7.9 for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-64) >= 5.7.9 for package: mysql-community-client-5.7.28-1.el7.x86_64
---> Package mysql-community-common.x86_64 0:5.7.28-1.el7 will be installed
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-libs.x86_64 0:5.7.28-1.el7 will be installed
---> Package mysql-community-server.x86_64 0:5.7.28-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.28-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.28-1.el7.x86_64

Packages skipped because of dependency problems:
    mysql-community-client-5.7.28-1.el7.x86_64 from mysql57-community
    mysql-community-common-5.7.28-1.el7.x86_64 from mysql57-community
    mysql-community-libs-5.7.28-1.el7.x86_64 from mysql57-community
    mysql-community-server-5.7.28-1.el7.x86_64 from mysql57-community
[root@ip-172-16-38-207 SageMaker]# 
[root@ip-172-16-38-207 SageMaker]# mysqld --version
-bash: mysqld: command not found

Answer 1

yum install --skip-broken は途中で失敗が有っても止めないで最後までやってみてくれというoptionです。足りないパッケージがるので、それをインストールしないと　mysqlはインストールできません。
Requires: systemd
Requires: libsasl2.so.3()(64bit)
の二つを要求していますのでまずこれのインストールを。