服务器评测
用rpmdb和yum解决依赖问题
在rhel5当中取消了rpmdb包（其实在fc4中就已经取消了），rpmdb主要是解决在安装包时的依赖关系。
通过以下方法可以查看究竟有没有安装rpmdb包。
[root@linux RPMS]# rpm -qa|grep rpmdb
rpmdb-RedHat-4-0.20050107
如何运用rpmdb来解决依赖关系呢？比如安装as4自带的apache时有很多依赖需要解决，如：
[root@linux RPMS]# rpm -ivh httpd-2.0.52-9.ent.i386.rpm
warning: httpd-2.0.52-9.ent.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
error: Failed dependencies:
httpd-suexec is needed by httpd-2.0.52-9.ent.i386
Suggested resolutions:
httpd-suexec-2.0.52-9.ent.i386.rpm
报错需要安装依赖包。用rpmdb工具自动解决依赖的方法是先执行rpm -ivh rpmdb*.rpm，
然后在安装其他软件包时加上–aid的参数。
[root@linux RPMS]# rpm -ivh –aid httpd-2.0.52-9.ent.i386.rpm
warning: httpd-2.0.52-9.ent.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
Preparing… ########################################### [100%]
1:httpd ########################################### [ 50%]
2:httpd-suexec ########################################### [100%]
安装完成了。
现在没有rpmdb工具，可以使用新的yum工具来完成。
组件包的安装都是通过yum来完成的，所以要对yum进行配置。
具体在命令行下操作如下：
1. mount -o loop rhel-5-server-dvd.iso /media/rhel
2. vi /etc/yum.repos.d/rhel-local.repo
[Cluster]
name=Red Hat Enterprise Linux $releasever – $basearch – Cluster
baseurl=file:///media/rhel/Cluster
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[ClusterStorage]
name=Red Hat Enterprise Linux $releasever – $basearch – ClusterStorage
baseurl=file:///media/rhel/ClusterStorage
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[Server]
name=Red Hat Enterprise Linux $releasever – $basearch – Server
baseurl=file:///media/rhel/Server
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[VT]
name=Red Hat Enterprise Linux $releasever – $basearch – VT
baseurl=file:///media/rhel/VT
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
3. mkdir -p /var/rhel/{Cluster,ClusterStorage,Server,VT}
4. createrepo -o /var/rhel/Cluster -g /media/rhel/Cluster/repodata/comps-rhel5-cluster.xml /media/rhel/Cluster
createrepo -o /var/rhel/ClusterStorage -g /media/rhel/ClusterStorage/repodata/comps-rhel5-cluster-st.xml /media/rhel/ClusterStorage
createrepo -o /var/rhel/Server -g /media/rhel/Server/repodata/comps-rhel5-server-core.xml /media/rhel/Server
createrepo -o /var/rhel/VT -g /media/rhel/VT/repodata/comps-rhel5-vt.xml /media/rhel/VT
5. mount –bind /var/rhel/Cluster/repodata /media/rhel/Cluster/repodata
mount –bind /var/rhel/ClusterStorage/repodata /media/rhel/ClusterStorage/repodata
mount –bind /var/rhel/Server/repodata /media/rhel/Server/repodata
mount –bind /var/rhel/VT/repodata /media/rhel/VT/repodata
6. yum clean all
