Cluster Agents

Setup OpenSVC Cluster Agents

Install the agents on the nodes of your provisioning cluster.

A minimal set of tools are advices for better file system support, virtualization of micro services and network debugging purpose.


Supposing the package is installed :

Since Agent version 1.9 the cluster need to be joined

Setup Heartbeat on the donor:

# nodemgr set --param hb#1.type --value unicast
# nodemgr get --kw cluster.secret

On the joiner:

# nodemgr daemon join --secret 3665ab8630e011e8ab20525400e412aa

Debian, Ubuntu:

apt-get install -y python net-tools docker-io psmisc zfsutils-linux system-config-lvm xfsprogs wget

Centos, RHEL:

sudo yum install -y net-tools docker bridge-utils git runc wget bind-utils

# bugfixes
cd /usr/libexec/docker/
sudo ln -s docker-runc-current docker-runc
echo "PATH=\$PATH:/usr/libexec/docker" >>/etc/sysconfig/opensvc
sed -i -e "s/: false/: true/" /etc/oci-register-machine.conf

Installing ZFS

Agent may require to communicate via root together setup a no password ssh access

sudo sed -i -e "s/^PasswordAuthentication no/PasswordAuthentication yes/" /etc/ssh/sshd_config                    
sudo systemctl restart sshd

You can verify that the agent is discovered by going to the web interface of replication-manager and check the agents tab.

Using Overlay Networking

Centos & Rehdat requires EPEL

yum install epel-release
yum install containernetworking-cni

Binary Install

cd /tmp
sudo mkdir -p /opt/cni/bin
cd  /opt/cni/bin
tar xvf /tmp/cni-amd64-v0.6.0.tgz
tar xvf /tmp/cni-plugins-amd64-v0.6.0.tgz

mkdir -p /opt/cni/net.d

Install one overlay CNI plugin like weave network

curl -L -o /usr/local/bin/weave
chmod a+x /usr/local/bin/weave

Make sure Docker daemon is started at boot and disable MountFlags:

sed -i s/^MountFlags=slave/#MountFlags=slave/ /lib/systemd/system/docker.service
systemctl enable docker
systemctl start docker

For each node

weave setup
weave launch $(nodemgr get --kw cluster.nodes)

mkdir -p /var/lib/opensvc/cni/net.d/
cat > /var/lib/opensvc/cni/net.d/repman.conf <<EOF
    "cniVersion": "0.2.0",
    "name": "repman",
    "type": "weave-net"

Make sure the OpenSVC Cluster is defined and joined before the next step Instruct the OpenSVC agent about cni path:

nodemgr set --kw cni.plugins=/usr/libexec/cni  
nodemgr set --kw cni.config=/var/lib/opensvc/cni/net.d

Check cni from agent

$ nodemgr network ls
$ nodemgr network show --id  repman        
`- repman                       
   |- cniVersion                0.2.0     
   |- type                      weavenet  
   `- name                      repman    

Check from weave

$ weave report

Setup the DNS as a docker service on each agent

svcmgr create -s odns  --config --provision

Upgrade agent version

nodemgr set --kw node.repopkg=
nodemgr updatepkg