Some distributions create the defaut KVM (libvirtd) storage pool for images when they install KVM, others do this upon the creation of the first KVM guest. Creating the default pool from scratch is pretty straightforward. Here's how to do it with virsh.
First verify there is no existing default pool:
$ virsh pool-list --all
Name State Autostart
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By default, KVM (libvirtd) images on Ubuntu and most other Linux distributions are found in /var/lib/libvirt/images. This can be inconvenient if you don't have a separate /var partition that can grow over time to accommodate multiple large images.
You can simply rename the images folder to something else and then symlink to a larger space with it (e.g. ln -s /data1/libvirt/images /var/lib/libvirt/images). That's what I used to do.
But that can lead to all sorts of unanticipated trouble. The right way to have your images on a bigger disk is to change the path for libvirt's default storage pool to a partition on that big disk, which is logically where KVM is going to create them.
NOTE: The Ubuntu package for libvirt-daemon-system automatically sets up a libvirt group for libvirt admins (that includes members of the sudo group by default). Members of libvirt can run virsh
| def get_lambda_event_source(self, event: dict): | |
| if 'pathParameters' in event and 'proxy' in event['pathParameters']: | |
| return 'api_gateway_aws_proxy' | |
| if 'requestContext' in event and 'resourceId' in event['requestContext']: | |
| return 'api_gateway_http' | |
| elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:s3': | |
| return 's3' | |
| elif 'Records' in event and len(event['Records']) > 0 and 'EventSource' in event['Records'][0] and event['Records'][0]['EventSource'] == 'aws:sns': | |
| return 'sns' |
Tools
Presentations
>>> docker exec -it CONTAINERID /bin/sh
/app # telnet
/bin/sh: telnet: not found
/app # apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
v3.7.0-243-gf26e75a186 [http://dl-cdn.alpinelinux.org/alpine/v3.7/main]
v3.7.0-229-g087f28e29d [http://dl-cdn.alpinelinux.org/alpine/v3.7/community]
Docker is available for Linux, MacOS, and Windows.
Docker for Mac is best installed with Homebrew and Homebrew Cask. For other ways to install on MacOS, see Install Docker for Mac in Docker's docs.
brew cask install docker # Install Docker
| # first install pygmentize to the mac OS X or macOS system with the built-in python | |
| sudo easy_install Pygments | |
| # then add alias to your ~/.bash_profile or ~/.bashrc or ~/.zshrc etc. | |
| alias pcat='pygmentize -f terminal256 -O style=native -g' |
| import boto3 | |
| class tableCreate(object): | |
| def __init__(self, **kwargs): | |
| self.__dict__.update(kwargs) | |
| # Query client and list_tables to see if table exists or not | |
| def queryCreate(self): | |
| # Instantiate your dynamo client object | |
| client = boto3.client('dynamodb') |