Grunt tasks to ease the deployment of application on clusters using Grunt, Docker and PkgCloud. These grunt tasks rely on the Gruntfile for configuration (an example can be found under /test).
The general concept is that a cluster is defined in terms of node types and Docker images, then it is deployed and commands are run against all nodes (or Docker images) of the cluster.
The provisioning tasks (must be run in a certain order, since nodes depends on security groups, and the actual IP addresses of nodes are known only after deployment (IP addresses are necessary to define intra-cluster security groups).
A given order must be observer when building and running Docker containers on the deployed nodes.
NOTE: To identify nodes, each is given an hostname composed by the cluster name and the node type: <cluster name>-<sequence number>-<node type name>
NOTE: to access VMs that are hidden behind a firewall, SSH tunnels can be used to operate on the cluster.
The first step is destroy existing SSG tunnels (if any), and create new ones, as in>
ps aux | grep "admin@vhprod" | sed -e "s/\s/|/g" | cut -f 2 -d'|' | xargs -i kill {}
ssh -f admin@vhprod-1-loadbalancer -L 2377:vh-1-apiserver:2375 -N
ssh -f admin@vhprod-1-loadbalancer -L 2277:vh-1-apiserver:22 -N
There need to be two ports open (SSH and Docker API), and the hostnames (vh-1-apiserver, vh-2-apiserver) are the ones on the VMs network (the network vhprod-1-loadbalancer -acting as gateway- sits).
The second step is to add a clusterAliases property to the Gruntfile, defining the VMs of every cluster hidden behind a firewall:
"clusterAliases" : {
"vhprod" : {
"ssh" : {
"username" : "admin",
"privateKeyFile" : "~/.ssh/id_rsa_admin"
},
"nodes" : [ {
"id" : "vhprod-1-loadbalancer-1",
"name" : "vhprod-1-loadbalancer",
"hostId" : "vhprod-1-loadbalancer-1",
"addresses" : {
"public" : [ "localhost" ],
"private" : [],
"dockerPort" : 2376,
"sshPort" : 2276
}
}, {
"id" : "vhprod-1-apiserver-2",
"name" : "vhprod-1-apiserver",
"hostId" : "vhprod-1-apiserver-2",
"addresses" : {
"public" : [ "localhost" ],
"private" : [],
"dockerPort" : 2377,
"sshPort" : 2277
}
}]
}
From now on, by specifying the cluster Grunt option and setting it to vhprod, the SSH tunnels will be used to manage the VMs behind the firewall.
To add some more run-time flexibility, EJS templates (http://ejs.co/) can be used in the options of Clouddity commands in the Gruntfile. The object which is passed to the template containes data about the current node being processed, more specifically:
"clouddityRuntime": {
"node": {
"node": {
"id": "74e6b162-7047-4f3d-bcc7-dd018325cbd9",
"name": "ccdev-1-couchdbc",
"address": "115.146.94.3",
"type": "couchdbc"
},
"images": ["couchdbc"],
"ssh": {
"host": "115.146.94.3",
"port": 22,
"username": "ubuntu",
"privateKeyFile": "/home/lmorandini/.ssh/id_rsa"
},
"docker": {
"protocol": "http",
"host": "115.146.94.3",
"port": 2375,
"auth": "username:password"
}
}
}
For instance, the actual node IP address can be passed when creating Docker containers by inserting this fragment in the Gruntfile:
In sensitive.json there is a user_data property that contains, encoded in base64, the instructions to setup Docker (on the non-default 3375 port) and secure it via HaProxy (on the usual 2375 port):
(The password is sha-512, encoded with mkpasswd -m sha-512 <password> .)
#!/bin/sh
set -x
echo "post-installation started..."
sudo rm -f /var/lib/dpkg/lock
sudo apt-get update
sudo apt-get install haproxy -y
HAPCFG=/etc/haproxy/haproxy.cfg
echo 'userlist UsersFor_Ops' | sudo tee --append ${HAPCFG}
echo ' group AdminGroup users docker' | sudo tee --append ${HAPCFG}
echo ' user docker password $6$JrosxjE0xDL.a6F3$gR5nHOpi7bAsaTmNXMdGHR/o/rfCAMyU01/p8kNxSnC0jB0b/3JXB5BZETlFZdRUP4AFQ6Ny0zYlQKeXgk3tq.' | sudo tee --append ${HAPCFG}
echo 'frontend http' | sudo tee --append ${HAPCFG}
echo ' bind 0.0.0.0:2375' | sudo tee --append ${HAPCFG}
echo ' use_backend docker' | sudo tee --append ${HAPCFG}
echo 'backend docker' | sudo tee --append ${HAPCFG}
echo ' server localhost localhost:3375' | sudo tee --append ${HAPCFG}
echo ' acl AuthOkay_Ops http_auth(UsersFor_Ops)' | sudo tee --append ${HAPCFG}
echo ' http-request auth realm MyAuthRealm if !AuthOkay_Ops' | sudo tee --append ${HAPCFG}
sudo service haproxy restart
sudo apt-get install docker.io -y -f
sudo usermod -aG docker ubuntu
echo 'DOCKER_OPTS="-H tcp://127.0.0.1:3375 -H unix:///var/run/docker.sock --insecure-registry cuttlefish.eresearch.unimelb.edu.au --insecure-registry docker.eresearch.unimelb.edu.au --log-opt max-size=10m --log-opt max-file=3"' | sudo tee --append /etc/default/docker
sudo openssl s_client -showcerts -connect docker.eresearch.unimelb.edu.au:443 < /dev/null 2> /dev/null | openssl x509 -outform PEM > eresearch.crt
sudo cp eresearch.crt /usr/local/share/ca-certificates
sudo update-ca-certificates
sudo sed -i 's/.*127.0.1.1/#&/' /etc/hosts
sudo service docker restart
sudo docker ps
echo "post-installation done"
The usual procedure for deploying a cluster is:
grunt clouddity:createsecuritygroups
grunt clouddity:createnodes
grunt clouddity:updatesecuritygroups
(the last step adds the actual IP addresses to the security group rules if needed)
...and the procedure to un-deploy is:
grunt clouddity:destroynodes
grunt clouddity:destroysecuritygroups
After Docker images are built and pushed to a Docker registry (grunt-dock can be used for that), Clouddity takes care of pulling the images from all the deployed nodes and creating Docker containers.
Before creating containers, configuration data can be uploaded to the nodes and then referenced by the Docker containers with the copytohost task.
The usual sequence of steps is
grunt clouddity:copytohost
grunt clouddity:pull
grunt clouddity:run
In addition, Docker containers can be stopped, started and removed. The containers are created and started according to the order the images are listed in the node type images property.
For debugging purpose, the verbose Grunt option could be useful, since it makes Docker prints out more information.
The final step is testing the cluster
grunt clouddity:test
For every node types an Array of tests can be performed, with the result of every request being tested either for containing a string, or starting with a string.
It could be useful to chain together tasks using the grunt.registerTask, but some steps take some time to complete after the control has returned to Grunt, hence they should be separated by "wait" task (grunt-wait may come in handy).
The execution of the createnodes task can be performed selectively only on a node type using the nodetype switch.
The execution of some Dpcker tasks (run, create, stop, start, remove) can be performed
selectively only on a node type using the nodetype switch. In addition, a single container can be targeted using the containerid switch, and a node as well with the nodeid switch (with the last two options, nodetype is ignored).
XXX TODO See in the tests directory
Print some information on the images available on the cloud provider.
Print some information on the flavors of the images available on the cloud provider.
Prints some information about the nodes defined in the Gruntfile that are deployed on the cloud. If the hosts-format option is used, the IP addresses and the hostnames are printed out in the format used by /etc/hosts.
Creates on the cloud the nodes as defined in the Gruntfile.
Deletes the nodes deployed on the cloud.
Prints some information about the security groups defined in the Gruntfile that are deployed on the cloud.
Creates the security groups defined in the Gruntfile, but without substituting remoteIpNodePrefixes with the actual IP addresses.
Substitutes remoteIpNodePrefixes with the actual IP addresses of the nodes deployed on the cloud.
Deletes the security groups deployed on the cloud.
Deletes the security groups deployed on the cloud.
Copies a series of files or directory from the development machine to the deployed nodes.
Adds the cluster IP addresses to each /etc/hosts of the nodes (the cluster addresses
take precedence, the existing /etc/hosts file being appended to the cluster addresses).
Pulls Docker images from a registry to all nodes in the cluster.
Creates and starts Docker containers from the pulled images.
Lists all the containers deployed on the cluster.
Starts all Docker containers.
Stops all Docker containers.
Remove all Docker containers.
Tests the cluster using HTTP requests.
Execute a command on deployed containers (the command is taken from the Grunt command options), as in:
grunt clouddity:exec --containerid <container id> --command "/load-data.sh"
(Usually the nodetype option is added, since commands are image-specific.)
Returns the logs of a given container:
grunt clouddity:logs --containerid <container id>
Execute a command on deployed nodes (not containers as exec) the command is taken from the Grunt command options), as in:
grunt clouddity:execnodes --nodetype db --command "echo 'ok' > /home/ubuntu/a.txt"
(Usually the nodetype option is added, but nodeid could be used as well)
- All the nodes need to have the Docker demon installed and running
- All the nodes need to have SSH server running and its port open
- The Docker registry of choice must be reachable from all the nodes
- SSH client installed
- Grunt installed
sudo npm install -g grunt --save-dev - Grunt-cli installed
npm install grunt-cli --save-dev - Docker installed and its daemon running on TCP port 2375
(add this line to the
/etc/default/dockerfile:DOCKER_OPTS="-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock"and restart the Docker daemon (sudo systemctl daemon-reload)
NOTE: On Ubuntu 15.04 and Docker 1.8.2, set this line:
ExecStart=/usr/bin/docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock
in /etc/systemd/system/docker.service and restart the Docker daemon
con sudo systemctl daemon-reload; sudo service docker restart
Mocha needs to be installed globally to run the tests (npm install -g mocha ).
npm test
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