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+---
+layout: "docs"
+page_title: "XenServer-iso Commented Example"
+description: |-
+  This is a Commented example for how to use the xenserver-iso Packer Builder.
+  This Example is written in hcl
+---
+
+# What's this 
+This Example builds a vanilla Centos 8 Template. No Provisioning or Post-Processing will be done.
+
+If you want to run this example, you have to replace the following variables with your own values.
+```hcl
+  remote_host     = "xenserver.example.org"
+  remote_username = "root"
+  remote_password = "very-secret-password"
+  sr_iso_name     = "Local-ISO"
+  sr_name         = "Local-SR"
+  tools_iso_name  = "guest-tools.iso"
+```
+
+## Parts of this example
+This examples composes the following files from the examples folder
+
+* [centos8-example.pkr.hcl](../../examples/http/centos/centos8-example.pkr.hcl)
+* [ks-centos8-example.cfg](../../examples/http/centos/ks-centos8-example.cfg)
+
+
+## Explanation of centos8-example.pkr.hcl
+
+* `source "xenserver-iso" "example" { } ` directs packer to configure an Artifact named example using the `xenserver-iso` builder
+
+* `iso_url  = "http://mirrors.ocf.berkeley.edu/centos/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-dvd1.iso" ` use the iso obtainable from this url
+* `iso_checksum_type = "sha1"` the checksum is of type sha1
+* `iso_checksum      = "aaf9d4b3071c16dbbda01dfe06085e5d0fdac76df323e3bbe87cce4318052247"` The checksum for the ISO. 
+
+* `sr_name        = "Local-SR"` store the vmdisk used during install on the SR named `Local-SR`
+* `sr_iso_name    = "Local-ISO"` store the iso used during install on the ISO-SR named `Local-ISO`
+* `tools_iso_name = "guest-tools.iso"` mount the guest-tools iso with the name `guest-tools.iso`
+
+* `remote_host     = "xenserver.example.org"` the ipadress or fqdn of the xenserver. This should be the pool primary
+* `remote_username = "root"` the user with witch to connect.
+* `remote_password = "very-secret-password"` the password for the user.
+
+* `vm_name        = "packer-centos8-example"` How packer will name the vm.
+* `vm_description = "This is an example."` The description field of the vm
+* `vm_memory      = 4096` the Amount of RAM, in MB
+* `disk_size      = 4096` the Size of the Primary Disk in MB
+
+* `http_directory = "examples/http/centos8'`  Packer will spin up a http-server for serving files to the installing vm. the kickstart file `ks-centos8-examples.cfg` is in this directory
+* `boot_wait      = "10s'`  Wait for 10s after starting the VM before typeing the `boot_command`
+* `boot_command   = ["<tab> text ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/ks-centos8-examples.cfg<enter><wait>"'` 
+  * The command to type into the installing vm.
+  * `<tab>` a tab Character `\t`
+  * `text ks=http://` character literals
+  * `{{ .HTTPIP }}` will be replaced by the local ip-address.
+  * `:` character literal
+  * `{{ .HTTPPort }}` will be replaced by the local port. Will be randomly selectet between 8000 and 9000
+  * `/ks-centos8-examples.cfg` character literals
+  * `<enter>` an enter character
+  * `<wait>` wait for 1s
+
+* `ssh_username     = "root"` The ssh user packer uses to connect to the VM
+* `ssh_password     = "centos"` The ssh password packer uses to connect to the VM
+* `ssh_wait_timeout = "10m"` consider install failed if unable to connect via ssh 10m into the build
+* `shutdown_command = "/sbin/shutdown"` After connection via ssh issue this command to shut down the vm
+* `output_directory = "packer-centos8-local"` Store the resulting xva file in this directory
+* `keep_vm          = "on_success"` Create a template with the vm after a successfull build
+
+* `build { }` Tell packer what to do while builing
+* `sources = ["xenserver-iso.example"]` Build the `xenserver.example` without changing any configuration.
+
+## Explanation of ks-centos8-examples.cfg
+```
+eula --agreed
+# agree to the eula of centos
+
+lang en-US.UTF-8
+# set the system-locale to en-US.UTF-8
+
+timezone Europe/Berlin
+# set the timezone to Europe/Berlin
+
+url --url="http://mirror.centos.org/centos/8.3.2011/BaseOS/x86_64/os/"
+# Primary installation mirror
+
+text
+skipx
+# Install in textmode, do not configure X11
+
+firstboot --disable
+# Dont do any configuration on first boot
+
+rootpw --plaintext centos
+# set the reboot to "centos"
+
+firewall --enabled --ssh
+# enable the firewall, allow ssh
+
+selinux --enforcing
+# ensure selinux is in enforcing mode
+
+logging --level=info
+# Installation logging level
+
+network  --bootproto=dhcp --device=eth0 --onboot=on
+# configure the network with dhcp on install
+
+clearpart --all
+zerombr
+bootloader --location=mbr
+# Clear all partitioning on all disk
+# Zero the MBR section
+# Install the bootloader into the MBR
+
+part / --asprimary --fstype="ext4" --size=1024 --grow
+# / shall the a primary partition with ext4
+# with a mimimul size of 1024 MB, but growing to the actual size of the disk
+
+%packages
+@base
+%end
+# install all packages of the core group
+
+reboot --eject
+# After finishing eject all CD-Disk and reboot
+```