146 lines
3.9 KiB
ReStructuredText
146 lines
3.9 KiB
ReStructuredText
.. _multinode:
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=============================
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Multinode Deployment of Kolla
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=============================
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Deploy a registry (required for multinode)
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==========================================
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A Docker registry is a locally hosted registry that replaces the need to pull
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from the Docker Hub to get images. Kolla can function with or without a local
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registry, however for a multinode deployment a registry is required.
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The Docker registry prior to version 2.3 has extremely bad performance because
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all container data is pushed for every image rather than taking advantage of
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Docker layering to optimize push operations. For more information reference
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`pokey registry <https://github.com/docker/docker/issues/14018>`__.
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The Kolla community recommends using registry 2.3 or later. To deploy registry
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with version greater than 2.3, do the following:
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::
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docker run -d -p 4000:5000 --restart=always --name registry registry:2
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.. note:: Kolla looks for the Docker registry to use port 4000. (Docker default is
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port 5000)
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After starting the registry, it is necessary to instruct Docker that it will
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be communicating with an insecure registry. To enable insecure registry
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communication on CentOS, modify the ``/etc/sysconfig/docker`` file to contain
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the following where 192.168.1.100 is the IP address of the machine where the
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registry is currently running:
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::
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# CentOS
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INSECURE_REGISTRY="--insecure-registry 192.168.1.100:4000"
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For Ubuntu, check whether its using upstart or systemd.
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::
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# stat /proc/1/exe
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File: '/proc/1/exe' -> '/lib/systemd/systemd'
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Edit ``/etc/default/docker`` and add:
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::
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# Ubuntu
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DOCKER_OPTS="--insecure-registry 192.168.1.100:4000"
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If Ubuntu is using systemd, additional settings needs to be configured.
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Copy Docker's systemd unit file to ``/etc/systemd/system/`` directory:
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::
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cp /lib/systemd/system/docker.service /etc/systemd/system/docker.service
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Next, modify ``/etc/systemd/system/docker.service``, add ``environmentFile``
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variable and add ``$DOCKER_OPTS`` to the end of ExecStart in ``[Service]``
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section:
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::
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# CentOS
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[Service]
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MountFlags=shared
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EnvironmentFile=/etc/sysconfig/docker
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ExecStart=/usr/bin/docker daemon $INSECURE_REGISTRY
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# Ubuntu
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[Service]
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MountFlags=shared
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EnvironmentFile=-/etc/default/docker
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ExecStart=/usr/bin/docker daemon -H fd:// $DOCKER_OPTS
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Restart Docker by executing the following commands:
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::
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# CentOS or Ubuntu with systemd
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systemctl daemon-reload
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systemctl restart docker
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# Ubuntu with upstart or sysvinit
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sudo service docker restart
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.. _edit-inventory:
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Edit the Inventory File
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=======================
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The ansible inventory file contains all the information needed to determine
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what services will land on which hosts. Edit the inventory file in the
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kolla-ansible directory ``ansible/inventory/multinode`` or if kolla-ansible
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was installed with pip, it can be found in ``/usr/share/kolla``.
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Add the ip addresses or hostnames to a group and the services associated with
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that group will land on that host:
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::
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# These initial groups are the only groups required to be modified. The
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# additional groups are for more control of the environment.
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[control]
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# These hostname must be resolvable from your deployment host
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control01
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192.168.122.24
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For more advanced roles, the operator can edit which services will be
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associated in with each group. Keep in mind that some services have to be
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grouped together and changing these around can break your deployment:
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::
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[kibana:children]
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control
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[elasticsearch:children]
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control
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[haproxy:children]
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network
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Deploying Kolla
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===============
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First, check that the deployment targets are in a state where Kolla may deploy
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to them:
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::
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kolla-ansible prechecks -i <path/to/multinode/inventory/file>
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For additional environment setup see the :ref:`deploying-kolla`.
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Run the deployment:
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::
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kolla-ansible deploy -i <path/to/multinode/inventory/file>
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