// AddOneNode is a helper to add a single node. Called repeatedly.
func AddOneNode(driver drivers.Driver) error {
nodes, err := docker.ListCockroachNodes()
if err != nil {
return util.Errorf("failed to get list of existing cockroach nodes: %v", err)
}
if len(nodes) == 0 {
return util.Errorf("no existing cockroach nodes detected, does the cluster exist?")
}
largestIndex, err := docker.GetLargestNodeIndex(nodes)
if err != nil {
return util.Errorf("problem parsing existing node list: %v", err)
}
nodeName := docker.MakeNodeName(largestIndex + 1)
// Create node.
err = docker.CreateMachine(driver, nodeName)
if err != nil {
return util.Errorf("could not create machine %s: %v", nodeName, err)
}
// Lookup node info.
nodeConfig, err := driver.GetNodeConfig(nodeName)
if err != nil {
return util.Errorf("could not get node config for %s: %v", nodeName, err)
}
// Do "start node" logic.
err = driver.StartNode(nodeName, nodeConfig)
if err != nil {
return util.Errorf("could not run StartNode steps for %s: %v", nodeName, err)
}
// Start the cockroach node.
err = docker.RunDockerStart(driver, nodeName, nodeConfig)
if err != nil {
return util.Errorf("could not initialize first cockroach node %s: %v", nodeName, err)
}
return nil
}
