centos luks image: use local repo dir, crypttab instead of kernel args

opennebula-images/centos-build-luks-opennebula-image.sh

@@ -93,6 +93,7 @@ dnf -y \
 	--disablerepo='*' \
 	$enabled_repos \
 	--setopt=install_weak_deps=False install \
+	--setopt=reposdir=rpm-repositories \
 	bash basesystem systemd dnf centos-release cryptsetup $release_specific_packages
 
 mount --bind /dev /mnt/dev
@@ -144,16 +145,15 @@ run_root systemctl enable chronyd.service
 # uncompressed but is a direct dependency of kernel-core...
 run_root dnf -y install kernel grub2
 
-# Add support for virtio block devices at boot time.
+# Add support for virtio block devices at boot time, configure bootloader.
 cat > /mnt/etc/dracut.conf.d/virtio-blk.conf <<EOF
 add_drivers="virtio-blk"
 EOF
 kernel_version=$(ls /mnt/boot | grep "vmlinuz.*.$ARCH" | cut -d- -f2-)
-run_root dracut -v --force --kver $kernel_version
-
-# Configure grub2.
 luks_uuid=$(blkid --match-tag UUID --output value "${LOOPBACK_DEVICE}p2")
-echo "GRUB_CMDLINE_LINUX='rd.luks.uuid=$luks_uuid'" >> /mnt/etc/default/grub
+echo "cryptroot  UUID=$luks_uuid  luks,timeout=30" >> /mnt/etc/crypttab
+
+run_root dracut -v --force --kver $kernel_version
 run_root grub2-install --target=i386-pc "${LOOPBACK_DEVICE}"
 run_root grub2-mkconfig -o /boot/grub2/grub.cfg
 

opennebula-images/rpm-repositories/centos-7-minus.repo

@@ -0,0 +1,16 @@
+[base]
+name=CentOS-$releasever - Base
+mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
+#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
+gpgcheck=0
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+#released updates 
+[updates]
+name=CentOS-$releasever - Updates
+mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
+#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
+gpgcheck=0
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7