OpenStack Image maker-centos

Mirroring in the cloud platform is also important, providing a variety of customized images to make the user experience even better.

The first time you played OpenStack was with the Cirros mentioned in the installation documentation, whose password Cubswin:) It was strange at first, and now it's ready to be played. PS: Playing is also very skilled:-)

Then slowly began to want to try a variety of mirrors, and so on the internet search a lot. As follows:

• Official Document Http://docs.openstack.org/image-guide/content/ch_obtaining_images.html
  The official documentation gives a lot of links to the images, including
  Cirros (test) images
  Official Ubuntu Images
  Official Red Hat Enterprise Linux Images
  Official Fedora Images
  Official OpenSUSE and SLES images
  Official images from the other Linux distributions
  Rackspace Cloud Builders (multiple distros) images
  Microsoft Windows Images
• CentOS Image http://cloud.centos.org/
• Rackspace Cloud Builders Https://github.com/rcbops/oz-image-build
• Radhat Mirror Https://openstack.redhat.com/Image_resources
• CentOS Gold Image
  http://catn.com/labs/centos-images/
  http://catn.com/2013/04/18/building-a-virtual-machine-image-for-centos/
  Teach you how to create an image of CentOS and provide a ready-made image download
  Image: Http://mirror.catn.com/pub/catn/images/qcow2/centos6.4-x86_64-gold-master.img
  The image user name: root password: changeme1122

There are a few things to note about CentOS image production:

(1) Modify the network information/etc/sysconfig/network-scripts/ifcfg-eth0 (erase Mac information), as follows:

Type=Ethernetdevice=eth0onboot=Yesbootproto=dhcpnm_controlled=no

(2) Delete the generated network device rules, otherwise the created image cannot be connected to the Internet

rm -rf/etc/udev/rules.d/

(3) Add a line to/etc/sysconfig/network

Nozerconf=yes

(4) Install cloud-init (optional), cloud-init can be at boot-up key injection and modify hostname , and so on, about Cloud-init, Chen Shak a Boven introduction:/http www.chenshake.com/about-openstack-centos-mirror/

# Yum Install -y cloud-utils Cloud-init parted
To modify the configuration file/etc/cloud/cloud.cfg, add the following cloud_init_modules:
-Resolv-conf

(5) Setup system can automatically obtain hostname and Ssh-key specified by OpenStack (optional)
Edit the/etc/rc.local file, which will execute after booting and add the following code:

1 if[!-d/root/.SSH]; Then2 mkdir-p/root/.SSH3 chmod  the/root/.SSH4 fi5 # Fetch Public key using HTTP6attempts= -7Failed=08 9  Ten  One  while[!-f/root/.SSH/authorized_keys]; Do ACurl-f http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key >/tmp/metadata-key 2>/dev/null - if[$?-eq0]; Then - Cat/tmp/metadata-key >>/root/.SSH/Authorized_keys the chmod 0600/root/.SSH/Authorized_keys -restorecon/root/.SSH/Authorized_keys - RM-f/tmp/metadata-Key - Echo"Successfully retrieved public key from instance metadata" + Echo“*****************" - Echo"AUTHORIZED KEYS" + Echo“*****************" A Cat/root/.SSH/Authorized_keys at Echo“*****************" -  -Curl-f http://169.254.169.254/latest/meta-data/hostname >/tmp/metadata-hostname 2>/dev/null - if[$?-eq0]; Then -Temp_host= 'Cat/tmp/metadata-hostname` - sed-I "S/^hostname=.*$/hostname= $TEMP _host/g"/etc/sysconfig/Network in/bin/hostname$TEMP _host - Echo"Successfully retrievedhostnameFrom instance metadata " to Echo“*****************" + Echo"HOSTNAME CONFIG" - Echo“*****************" the Cat/etc/sysconfig/Network * Echo“*****************" $ Panax Notoginseng Else - Echo"Failed to retrievehostnameFrom instance metadata. This was a soft error so we ' ll continue " the fi + RM-f/tmp/metadata-hostname A Else thefailed=$ (($FAILED +1)) + if[$FAILED-ge $ATTEMPTS]; Then - Echo"Failed to retrieve public key from instance metadata after $FAILED attempts, quitting" $  Break $ fi - Echo"Could not retrieve public key from instance metadata (attempt # $FAILED/$ATTEMPTS), retryinginch 5seconds ... " - Sleep 5 the fi -  Done 

Or

1 # Set a random pass on first boot2 if[-f/root/firstrun]; Then3   DD if=/dev/urandom count= -|md5sum|passwd--stdin Root4   passwd-L Root5   RM/root/FirstRun6 fi7 8 if[!-d/root/.SSH]; Then9   mkdir-M0700-p/root/.SSHTenrestorecon/root/.SSH One fi A# Get The rootSSHKey Setup -# Get The rootSSHKey Setup -retry=0 the  while[!-f/root/.SSH/authorized_keys] && [$ReTry-ltTen]; Do -   Sleep 2 -Curl-f http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key >/root/.ssh/pubkey -   if[0-eq0]; Then +     MV/root/.SSH/pubkey/root/.SSH/Authorized_keys -   fi +retry=$[retry+1] A  Done at chmod  -/root/.SSH/authorized_keys && restorecon/root/.SSH/authorized_keys

The main goal is to get hostname and public keys

(6) Other

Route command to view the routing table

See if Permitrootlogin is yes in/etc/ssh/sshd_conf

OpenStack Image maker-centos