More elaborate example
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commit
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@ -14,7 +14,7 @@ label custom_seed
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kernel /install/vmlinuz
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append initrd=/install/initrd.gz file=/cdrom/preseed/custom.seed --
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label minimap_vm
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label minimal_vm
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menu label ^Minimal VM
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kernel /install/vmlinuz
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append initrd=/install/initrd.gz file=/cdrom/preseed/ubuntu-server-minimalvm.seed --
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@ -66,21 +66,128 @@ htop
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%post
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# Add arbitrary shell code to execute in the installer environment below here
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# run upgrades at first boot
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# Ubuntu user
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useradd --create-home --groups sudo --shell /bin/bash ubuntu
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echo "ubuntu:ubuntu" | chpasswd
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touch /home/ubuntu/.sudo_as_admin_successful
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# First time startup script
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cat <<"EOF" > /usr/local/sbin/vm-firstboot.sh
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#!/bin/bash
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set +x
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sed -i -E "s/^#?PermitRootLogin .+/PermitRootLogin yes/" /etc/ssh/sshd_config
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apt-get update
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apt-get dist-upgrade -y
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apt-get install -y open-vm-tools
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rm /etc/firstboot
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reboot
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EOF
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chmod +x /usr/local/sbin/vm-firstboot.sh
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# and systemd unit to call it
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cat <<"EOF" > /etc/systemd/system/vm-firstboot.service
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[Unit]
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Description=Initialize this template-created VM
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ConditionPathExists=/etc/firstboot
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[Service]
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Type=oneshot
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ExecStart=/usr/local/sbin/vm-firstboot.sh
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[Install]
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WantedBy=multi-user.target
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EOF
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ln -s /etc/systemd/system/vm-firstboot.service /etc/systemd/system/multi-user.target.wants/vm-firstboot.service
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touch /etc/firstboot
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sed -i -e "s/exit\s*0//" /etc/rc.local
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cat <<EOT >> /etc/rc.local
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# Below this line can be removed after first boot
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if [ -f /etc/firstboot ] ; then
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set +e
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sed -i -E "s/^PermitRootLogin .+/PermitRootLogin yes/" /etc/ssh/sshd_config
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apt-get update
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apt-get dist-upgrade -y
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# Install new kernel on 14.04
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#apt-get install -y linux-generic-lts-xenial open-vm-tools
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# revert to upstart on 16.04
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#apt-get install -y upstart-sysv
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rm /etc/firstboot
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reboot
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fi
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EOT
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# Template cleanup helper script
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cat <<"EOF" > /usr/local/sbin/vm-clean.sh
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#!/bin/bash
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touch /etc/firstboot
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rm -f /etc/ssh/*key*
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rm -f /etc/machine-id
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EOF
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chmod +x /usr/local/sbin/vm-clean.sh
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# First boot ssh key regen
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cat <<"EOF" > /lib/systemd/system/ssh.service
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[Unit]
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Description=OpenBSD Secure Shell server
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After=network.target auditd.service
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ConditionPathExists=!/etc/ssh/sshd_not_to_be_run
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[Service]
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EnvironmentFile=-/etc/default/ssh
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ExecStartPre=/bin/bash -c "test -f /etc/ssh/ssh_host_rsa_key || ssh-keygen -A"
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ExecStartPre=/usr/sbin/sshd -t
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ExecStart=/usr/sbin/sshd -D $SSHD_OPTS
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ExecReload=/usr/sbin/sshd -t
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ExecReload=/bin/kill -HUP $MAINPID
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KillMode=process
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Restart=on-failure
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RestartPreventExitStatus=255
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Type=notify
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RuntimeDirectory=sshd
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RuntimeDirectoryMode=0755
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[Install]
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WantedBy=multi-user.target
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Alias=sshd.service
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EOF
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# First boot machine uuidgen
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cat <<"EOF" > /etc/systemd/system/machineidgen.service
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[Unit]
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Description=Regen machine-id on first boot
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Before=systemd-networkd.service systemd-journald.service
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After=local-fs.target
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ConditionPathExists=!/etc/machine-id
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[Service]
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Type=oneshot
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ExecStart=/bin/systemd-machine-id-setup
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[Install]
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WantedBy=multi-user.target
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EOF
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ln -s /etc/systemd/system/machineidgen.service /etc/systemd/system/multi-user.target.wants/machineidgen.service
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rm /etc/machine-id
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# Show IP address on console
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cp /etc/issue /etc/issue.tpl
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cat <<"EOF" > /usr/local/sbin/console-set-ip.sh
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#!/bin/bash
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cat /etc/issue.tpl > /etc/issue
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(ip addr | grep inet | awk '{print $2}' | grep -vE '^(::|fe80|127\.0\.0)') 2>&1 >> /etc/issue
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echo "" >> /etc/issue
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EOF
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chmod +x /usr/local/sbin/console-set-ip.sh
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cat <<"EOF" > /etc/systemd/system/consoleip.service
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[Unit]
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Description=Display machine ip on console
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After=network.target
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[Service]
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Type=oneshot
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ExecStart=/usr/local/sbin/console-set-ip.sh
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[Install]
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WantedBy=multi-user.target
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EOF
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ln -s /etc/systemd/system/consoleip.service /etc/systemd/system/multi-user.target.wants/consoleip.service
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rm -f /etc/update-motd.d/50-motd-news /etc/update-motd.d/80-livepatch
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@ -14,7 +14,7 @@ label custom_seed
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kernel /install/vmlinuz
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append initrd=/install/initrd.gz file=/cdrom/preseed/custom.seed --
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label minimap_vm
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label minimal_vm
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menu label ^Minimal VM
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kernel /install/vmlinuz
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append initrd=/install/initrd.gz file=/cdrom/preseed/ubuntu-server-minimalvm.seed --
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