virsnap is a CLI snapshot utility for libvirt. The small tool is designed for the automated creation of virtual machine snapshots (e.g. KVM domains). In addition to creating snapshots, the tool allows to remove expired snapshots if there are enough newer snapshots for this virtual machine.
virsnap is a small tool that eases the automated creation and deletion of VM snapshots.
Usage:
virsnap [command]
Available Commands:
clean Remove expired snapshots from the system
create Create a snapshot of one or more virtual machines
help Help about any command
list List snapshots of one or more virtual machines
version Print the version of the software
Flags:
-h, --help help for virsnap
-v, --verbose verbose output
Use "virsnap [command] --help" for more information about a command.
joroec@host:~ $ virsnap list "^examplevm[0-9]*$"
examplevm1 (current state: DOMAIN_PAUSED, 1 snapshots total)
+------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+------------------------+-------------------------------+---------+
| virsnap_heuristic_bose | Thu Jul 11 08:37:50 CEST 2019 | shutoff |
+------------------------+-------------------------------+---------+
examplevm2 (current state: DOMAIN_RUNNING, 2 snapshots total)
+--------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+--------------------------+-------------------------------+---------+
| virsnap_hardcore_galileo | Thu Jul 11 08:39:51 CEST 2019 | running |
| virsnap_angry_hypatia | Thu Jul 11 08:40:15 CEST 2019 | shutoff |
+--------------------------+-------------------------------+---------+
joroec@host:~ $ virsnap list
examplevm1 (current state: DOMAIN_SHUTOFF, 1 snapshots total)
+------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+------------------------+-------------------------------+---------+
| virsnap_heuristic_bose | Thu Jul 11 08:37:50 CEST 2019 | shutoff |
+------------------------+-------------------------------+---------+
examplevm2 (current state: DOMAIN_RUNNING, 2 snapshots total)
+--------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+--------------------------+-------------------------------+---------+
| virsnap_hardcore_galileo | Thu Jul 11 08:39:51 CEST 2019 | running |
| virsnap_angry_hypatia | Thu Jul 11 08:40:15 CEST 2019 | shutoff |
+--------------------------+-------------------------------+---------+
othervm1 (current state: DOMAIN_RUNNING, 1 snapshots total)
+-------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+-------------------------+-------------------------------+---------+
| virsnap_gracious_turing | Thu Jul 11 09:05:36 CEST 2019 | shutoff |
+-------------------------+-------------------------------+---------+
joroec@host:~ $ virsnap create --shutdown --force --verbose "^examplevm2$"
DEBU[0000] Trying to shutdown domain "examplevm2" gracefully.
DEBU[0000] Sending shutdown request to VM "examplevm2".
DEBU[0000] Waiting vor the VM "examplevm2" to shutdown.
DEBU[0065] Beginning creation of snapshot for VM "examplevm2".
INFO[0065] Created snapshot "virsnap_condescending_fermat" for VM "examplevm2".
DEBU[0065] Restoring previous state of vm "examplevm2"
DEBU[0066] Leaving creation of snapshot "virsnap_condescending_fermat" for VM "examplevm2".
The parameter k specifies the versions to keep:
joroec@host:~ $ virsnap list "^examplevm2$"
examplevm2 (current state: DOMAIN_RUNNING, 4 snapshots total)
+------------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+------------------------------+-------------------------------+---------+
| virsnap_hardcore_galileo | Thu Jul 11 08:39:51 CEST 2019 | running |
| virsnap_angry_hypatia | Thu Jul 11 08:40:15 CEST 2019 | shutoff |
| virsnap_cranky_sammet | Thu Jul 11 09:07:55 CEST 2019 | shutoff |
| virsnap_condescending_fermat | Thu Jul 11 09:09:09 CEST 2019 | shutoff |
+------------------------------+-------------------------------+---------+
joroec@host:~ $ virsnap clean -y -k 2 "^examplevm2$"
INFO[0000] Removing snapshot "virsnap_hardcore_galileo" of VM "examplevm2".
INFO[0000] Removing snapshot "virsnap_angry_hypatia" of VM "examplevm2".
joroec@host:~ $ virsnap list "^examplevm2$"
examplevm2 (current state: DOMAIN_RUNNING, 2 snapshots total)
+------------------------------+-------------------------------+---------+
| SNAPSHOT | TIME | STATE |
+------------------------------+-------------------------------+---------+
| virsnap_cranky_sammet | Thu Jul 11 09:07:55 CEST 2019 | shutoff |
| virsnap_condescending_fermat | Thu Jul 11 09:09:09 CEST 2019 | shutoff |
+------------------------------+-------------------------------+---------+
virsnap needs go 1.12+ and uses go modules for dependency management. For more
information on go modules, see the corresponding go modules documentation.
First make sure libvirt is installed. You can use your local packet manager or compile it by yourself.
On Ubuntu, you can use apt:
sudo apt-get install libvirt-bin libvirt-devOn macOS, you can use Homebrew:
brew install libvirtTo install virsnap, execute the following in your shell:
git clone http://github.com/joroec/virsnap
cd virsnap
go build
sudo install virsnap /usr/local/bin/virsnapThis will compile and link the virsnap binary and install it into
/usr/local/bin/virsnap. No other file is installed in system directories.
To remove the tool from your system, execute the following in your shell:
sudo rm /usr/local/bin/virsnapSee CONTRIBUTING.md file.
You should always prefer your distribution's packet manager for installing software. If your packet manager does not offer a suitable packet for golang 1.12, you can install it manually. The following are the commands needed for the manual installation on a Ubuntu 18.04 LTS system.
I prefer to compile software by myself. Alternatively, you can use a release link to download a binary release of golang. You can find the direct link to the current go version at the release page. The following will build golang from source:
Visit the official build guide for more information.
Newer versions of the golang compiler are written completely in golang.
In compiler construction, there is typically a bootstrap version of a compiler
written in another language (e.g. C) to compile the actual compiler. For golang,
this is the release branch release-branch.go1.4 which is a bootstrap compiler
for golang written in C. You need to have a GCC or Clang compiler installed
on your system.
Start with downloading the golang source code:
$ sudo apt-get update && sudo apt-get upgrade
$ git clone https://github.com/golang/goNow, build the bootstrap compiler:
$ git checkout release-branch.go1.4
$ cd src
$ ./all.bash
...
net/rpc/jsonrpc
Build complete; skipping tests.
To force tests, set GO14TESTS=1 and re-run, but expect some failures.
$ cd ../../
$ cp -r go /tmp/go-bootstrapNow, change back to the desired release brach and compile the golang compiler:
cd go
git checkout go1.12.6
git clean -df
cd src
GOROOT_BOOTSTRAP=/tmp/go-bootstrap GOROOT_FINAL=/usr/local/lib/go GOBIN=/usr/local/bin ./make.bash
Building Go cmd/dist using /tmp/go-bootstrap.
Building Go toolchain1 using /tmp/go-bootstrap.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for linux/amd64.
---
Installed Go for linux/amd64 in /home/.../go
Installed commands in /home/.../go/bin
The binaries expect /home/.../go to be copied or moved to /usr/local/lib/go
In the last step, you need to install your newly compiled go compiler to your system:
cd ../../
sudo cp -r go /usr/local/lib/go
sudo ln -s /usr/local/lib/go/bin/go /usr/local/bin/go
sudo ln -s /usr/local/lib/go/bin/gofmt /usr/local/bin/gofmtTo clean your system from the intermediate products and repositories, you can execute the following commands:
rm -rf /tmp/go-bootstrap
rm -rf go
Finally, you can set up your golang workspace:
mkdir ~/.go-workspaceand add to your ~/.bash_profile / .zshrc:
export GOPATH=$HOME/.go-workspace
See AUTHORS file.
MIT License. See LICENSE file.
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