init

2025-12-29 13:38:39 +08:00
commit 1a4aa9a660
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+
+
+```bash
+#!/bin/bash
+
+## **Updates to this file are now at https://github.com/giovtorres/kvm-install-vm.**
+## **This updated version has more options and less hardcoded variables.**
+
+# Take one argument from the commandline: VM name
+if ! [ $# -eq 1 ]; then
+    echo "Usage: $0 <node-name>"
+    exit 1
+fi
+
+# Check if domain already exists
+virsh dominfo $1 > /dev/null 2>&1
+if [ "$?" -eq 0 ]; then
+    echo -n "[WARNING] $1 already exists.  "
+    read -p "Do you want to overwrite $1 (y/[N])? " -r
+    if [[ $REPLY =~ ^[Yy]$ ]]; then
+        echo ""
+        virsh destroy $1 > /dev/null
+        virsh undefine $1 > /dev/null
+    else
+        echo -e "\nNot overwriting $1. Exiting..."
+        exit 1
+    fi
+fi
+
+# Directory to store images
+DIR=~/virt/images
+
+# Location of cloud image
+IMAGE=$DIR/CentOS-7-x86_64-GenericCloud.qcow2
+
+# Amount of RAM in MB
+MEM=768
+
+# Number of virtual CPUs
+CPUS=1
+
+# Cloud init files
+USER_DATA=user-data
+META_DATA=meta-data
+CI_ISO=$1-cidata.iso
+DISK=$1.qcow2
+
+# Bridge for VMs (default on Fedora is virbr0)
+BRIDGE=virbr0
+
+# Start clean
+rm -rf $DIR/$1
+mkdir -p $DIR/$1
+
+pushd $DIR/$1 > /dev/null
+
+    # Create log file
+    touch $1.log
+
+    echo "$(date -R) Destroying the $1 domain (if it exists)..."
+
+    # Remove domain with the same name
+    virsh destroy $1 >> $1.log 2>&1
+    virsh undefine $1 >> $1.log 2>&1
+
+    # cloud-init config: set hostname, remove cloud-init package,
+    # and add ssh-key 
+    cat > $USER_DATA << _EOF_
+#cloud-config
+
+# Hostname management
+preserve_hostname: False
+hostname: $1
+fqdn: $1.example.local
+
+# Remove cloud-init when finished with it
+runcmd:
+  - [ yum, -y, remove, cloud-init ]
+
+# Configure where output will go
+output: 
+  all: ">> /var/log/cloud-init.log"
+
+# configure interaction with ssh server
+ssh_svcname: ssh
+ssh_deletekeys: True
+ssh_genkeytypes: ['rsa', 'ecdsa']
+
+# Install my public ssh key to the first user-defined user configured 
+# in cloud.cfg in the template (which is centos for CentOS cloud images)
+ssh_authorized_keys:
+  - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDBil2QzORhDcnKiVVNpO5daOSYVp8nshcIc7aTEkdlqCRir2Oni8BEStK7x7bvh0jrp9KptlHPeos87fQs//VXEb1FEprL2c6fPWmVdtjmYw3yzSkaFKMksL7FdUoEiwF6t8pQAg2mU0Qj9emSHBKg5ttdGqNoSvXc92k7iOzgauda7jdNak+Dx9dPhR3FJwHMcZSlQHO4cweZcK63bZitxlFkJ/FJdry/TBirDhRcXslOJ3ECU2xiyRXJVPs3VNLjMdOTTAoMmZj+GraUBbQ9VIqe683xe02sM83th5hj2C4gW3qXUoFkNLfKAMRxXLRMEwI3ABFB/AAUhACxyTJp giovanni@throwaway
+_EOF_
+
+    echo "instance-id: $1; local-hostname: $1" > $META_DATA
+
+    echo "$(date -R) Copying template image..."
+    cp $IMAGE $DISK
+
+    # Create CD-ROM ISO with cloud-init config
+    echo "$(date -R) Generating ISO for cloud-init..."
+    genisoimage -output $CI_ISO -volid cidata -joliet -r $USER_DATA $META_DATA &>> $1.log
+
+    echo "$(date -R) Installing the domain and adjusting the configuration..."
+    echo "[INFO] Installing with the following parameters:"
+    echo "virt-install --import --name $1 --ram $MEM --vcpus $CPUS --disk
+    $DISK,format=qcow2,bus=virtio --disk $CI_ISO,device=cdrom --network
+    bridge=virbr0,model=virtio --os-type=linux --os-variant=rhel7 --noautoconsole"
+
+    virt-install --import --name $1 --ram $MEM --vcpus $CPUS --disk \
+    $DISK,format=qcow2,bus=virtio --disk $CI_ISO,device=cdrom --network \
+    bridge=virbr0,model=virtio --os-type=linux --os-variant=rhel7 --noautoconsole
+
+    MAC=$(virsh dumpxml $1 | awk -F\' '/mac address/ {print $2}')
+    while true
+    do
+        IP=$(grep -B1 $MAC /var/lib/libvirt/dnsmasq/$BRIDGE.status | head \
+             -n 1 | awk '{print $2}' | sed -e s/\"//g -e s/,//)
+        if [ "$IP" = "" ]
+        then
+            sleep 1
+        else
+            break
+        fi
+    done
+
+    # Eject cdrom
+    echo "$(date -R) Cleaning up cloud-init..."
+    virsh change-media $1 hda --eject --config >> $1.log
+
+    # Remove the unnecessary cloud init files
+    rm $USER_DATA $CI_ISO
+
+    echo "$(date -R) DONE. SSH to $1 using $IP with  username 'centos'."
+
+popd > /dev/null
+```