Improve logging and DRY some of the port mapping code
This commit is contained in:
Chris Bednarski
parent
e9bc0905d1
commit
bac9bd60dc
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@ -97,7 +97,7 @@ func (d *DockerDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool
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// Initialize docker API client
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client, err := d.dockerClient()
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if err != nil {
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d.logger.Printf("[DEBUG] driver.docker: could not connect to docker daemon: %s", err)
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d.logger.Printf("[INFO] driver.docker: failed to initialize client: %s", err)
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return false, nil
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}
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@ -106,8 +106,10 @@ func (d *DockerDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool
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return false, fmt.Errorf("Unable to parse docker.privileged.enabled: %s", err)
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}
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if privileged == true {
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d.logger.Printf("[DEBUG] driver.docker: privileged containers enabled. Only enable if needed")
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d.logger.Printf("[INFO] driver.docker: privileged containers are enabled")
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node.Attributes["docker.privileged.enabled"] = "1"
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} else {
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d.logger.Printf("[INFO] driver.docker: privileged containers are disabled")
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}
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_, err = strconv.ParseBool(d.config.ReadDefault("docker.cleanup.container", "true"))
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@ -124,7 +126,7 @@ func (d *DockerDriver) Fingerprint(cfg *config.Config, node *structs.Node) (bool
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// Docker isn't available so we'll simply disable the docker driver.
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env, err := client.Version()
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if err != nil {
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d.logger.Printf("[INFO] driver.docker: connection to daemon failed: %s", err)
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d.logger.Printf("[INFO] driver.docker: could not connect to docker daemon at %s: %s", client.Endpoint(), err)
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return false, nil
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}
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node.Attributes["driver.docker"] = "1"
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@ -152,8 +154,10 @@ func (d *DockerDriver) containerBinds(alloc *allocdir.AllocDir, task *structs.Ta
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func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, driverConfig *DockerDriverConfig) (docker.CreateContainerOptions, error) {
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var c docker.CreateContainerOptions
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if task.Resources == nil {
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// Guard against missing resources. We should never have been able to
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// schedule a job without specifying this.
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d.logger.Printf("[ERR] driver.docker: task.Resources is empty")
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return c, fmt.Errorf("task.Resources is nil and we can't constrain resource usage. We shouldn't have been able to schedule this in the first place.")
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return c, fmt.Errorf("task.Resources is empty")
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}
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binds, err := d.containerBinds(ctx.AllocDir, task)
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@ -211,22 +215,14 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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d.logger.Printf("[DEBUG] driver.docker: binding directories %#v for %s", hostConfig.Binds, task.Config["image"])
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// set privileged mode
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hostPrivileged, err := strconv.ParseBool(d.config.ReadDefault("docker.privileged.enabled", "false"))
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if err != nil {
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return c, fmt.Errorf("Unable to parse docker.privileged.enabled: %s", err)
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}
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if driverConfig.Privileged {
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if !hostPrivileged {
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return c, fmt.Errorf(`Unable to set privileged flag since "docker.privileged.enabled" is false`)
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}
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hostConfig.Privileged = driverConfig.Privileged
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hostPrivileged := d.config.ReadBoolDefault("docker.privileged.enabled", false)
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if driverConfig.Privileged && !hostPrivileged {
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return c, fmt.Errorf(`Unable to set privileged flag since "docker.privileged.enabled" is false`)
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}
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hostConfig.Privileged = hostPrivileged
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// set DNS servers
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dns := driverConfig.DNS
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if dns != "" {
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for _, v := range strings.Split(dns, ",") {
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ip := strings.TrimSpace(v)
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@ -240,7 +236,6 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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// set DNS search domains
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dnsSearch := driverConfig.SearchDomains
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if dnsSearch != "" {
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for _, v := range strings.Split(dnsSearch, ",") {
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hostConfig.DNSSearch = append(hostConfig.DNSSearch, strings.TrimSpace(v))
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@ -250,7 +245,7 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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mode := driverConfig.NetworkMode
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if mode == "" {
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// docker default
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d.logger.Printf("[WARN] driver.docker: no mode specified for networking, defaulting to bridge")
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d.logger.Printf("[INFO] driver.docker: no mode specified for networking, defaulting to bridge")
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mode = "bridge"
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}
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@ -266,7 +261,10 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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// Setup port mapping and exposed ports
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if len(task.Resources.Networks) == 0 {
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d.logger.Print("[WARN] driver.docker: No network resources are available for port mapping")
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d.logger.Print("[INFO] driver.docker: No network interfaces are available")
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if len(driverConfig.PortMap[0]) > 0 {
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return nil, fmt.Errorf("Trying to map ports but no network interface is available")
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}
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} else {
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// TODO add support for more than one network
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network := task.Resources.Networks[0]
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@ -274,11 +272,14 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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exposedPorts := map[docker.Port]struct{}{}
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for _, port := range network.ReservedPorts {
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publishedPorts[docker.Port(strconv.Itoa(port.Value)+"/tcp")] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: strconv.Itoa(port.Value)}}
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publishedPorts[docker.Port(strconv.Itoa(port.Value)+"/udp")] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: strconv.Itoa(port.Value)}}
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portStr := docker.Port(port.Value)
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publishedPorts[portStr+"/tcp"] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: strconv.Itoa(port.Value)}}
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publishedPorts[portStr+"/udp"] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: strconv.Itoa(port.Value)}}
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d.logger.Printf("[DEBUG] driver.docker: allocated port %s:%d -> %d (static)\n", network.IP, port.Value, port.Value)
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exposedPorts[docker.Port(strconv.Itoa(port.Value)+"/tcp")] = struct{}{}
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exposedPorts[docker.Port(strconv.Itoa(port.Value)+"/udp")] = struct{}{}
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exposedPorts[portStr+"/tcp"] = struct{}{}
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exposedPorts[portStr+"/udp"] = struct{}{}
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d.logger.Printf("[DEBUG] driver.docker: exposed port %d\n", port.Value)
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}
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@ -288,15 +289,19 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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if !ok {
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containerPort = port.Value
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}
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cp := strconv.Itoa(containerPort)
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hostPort := strconv.Itoa(port.Value)
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publishedPorts[docker.Port(cp+"/tcp")] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: hostPort}}
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publishedPorts[docker.Port(cp+"/udp")] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: hostPort}}
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containerPortStr := docker.Port(strconv.Itoa(containerPort))
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hostPortStr := strconv.Itoa(port.Value)
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publishedPorts[containerPortStr+"/tcp"] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: hostPortStr}}
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publishedPorts[containerPortStr+"/udp"] = []docker.PortBinding{docker.PortBinding{HostIP: network.IP, HostPort: hostPortStr}}
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d.logger.Printf("[DEBUG] driver.docker: allocated port %s:%d -> %d (mapped)", network.IP, port.Value, containerPort)
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exposedPorts[docker.Port(cp+"/tcp")] = struct{}{}
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exposedPorts[docker.Port(cp+"/udp")] = struct{}{}
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d.logger.Printf("[DEBUG] driver.docker: exposed port %s\n", hostPort)
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containerToHostPortMap[cp] = port.Value
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exposedPorts[containerPortStr+"/tcp"] = struct{}{}
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exposedPorts[containerPortStr+"/udp"] = struct{}{}
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d.logger.Printf("[DEBUG] driver.docker: exposed port %s\n", hostPortStr)
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containerToHostPortMap[string(containerPortStr)] = port.Value
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}
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env.SetPorts(containerToHostPortMap)
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@ -316,9 +321,10 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task, dri
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if driverConfig.Args != "" {
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cmd = append(cmd, parsedArgs...)
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}
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d.logger.Printf("[DEBUG] driver.docker: setting container startup command to: %s\n", strings.Join(cmd, " "))
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config.Cmd = cmd
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} else if driverConfig.Args != "" {
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d.logger.Println("[DEBUG] driver.docker: ignoring args because command not specified")
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d.logger.Println("[DEBUG] driver.docker: ignoring command arguments because command is not specified")
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}
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config.Env = env.List()
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@ -394,7 +400,7 @@ func (d *DockerDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle
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err = client.PullImage(pullOptions, authOptions)
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if err != nil {
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d.logger.Printf("[ERR] driver.docker: pulling container %s", err)
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d.logger.Printf("[ERR] driver.docker: failed pulling container %s:%s: %s", repo, tag, err)
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return nil, fmt.Errorf("Failed to pull `%s`: %s", image, err)
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}
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d.logger.Printf("[DEBUG] driver.docker: docker pull %s:%s succeeded", repo, tag)
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@ -402,7 +408,7 @@ func (d *DockerDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle
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// Now that we have the image we can get the image id
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dockerImage, err = client.InspectImage(image)
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if err != nil {
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d.logger.Printf("[ERR] driver.docker: getting image id for %s", image)
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d.logger.Printf("[ERR] driver.docker: failed getting image id for %s", image)
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return nil, fmt.Errorf("Failed to determine image id for `%s`: %s", image, err)
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}
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}
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