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docker: use Nomad managed resolv.conf when DNS options are set #8600

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merged 2 commits into from
Aug 17, 2020
Merged

docker: use Nomad managed resolv.conf when DNS options are set #8600

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151dacd
docker: use Nomad managed resolv.conf when DNS options are set
nickethier Aug 6, 2020
04ee989
docker: skip windows for dns test
nickethier Aug 6, 2020
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57 changes: 35 additions & 22 deletions drivers/docker/driver.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ import (
"github.com/hashicorp/nomad/client/taskenv"
"github.com/hashicorp/nomad/drivers/docker/docklog"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/drivers/shared/resolvconf"
nstructs "github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
Expand Down Expand Up @@ -915,28 +916,6 @@ func (d *Driver) createContainerConfig(task *drivers.TaskConfig, driverConfig *T
hostConfig.ShmSize = driverConfig.ShmSize
}

// setup Nomad DNS options, these are overridden by docker driver specific options
if task.DNS != nil {
hostConfig.DNS = task.DNS.Servers
hostConfig.DNSSearch = task.DNS.Searches
hostConfig.DNSOptions = task.DNS.Options
}

if len(driverConfig.DNSSearchDomains) > 0 {
hostConfig.DNSSearch = driverConfig.DNSSearchDomains
}
if len(driverConfig.DNSOptions) > 0 {
hostConfig.DNSOptions = driverConfig.DNSOptions
}
// set DNS servers
for _, ip := range driverConfig.DNSServers {
if net.ParseIP(ip) != nil {
hostConfig.DNS = append(hostConfig.DNS, ip)
} else {
logger.Error("invalid ip address for container dns server", "ip", ip)
}
}

// Setup devices
for _, device := range driverConfig.Devices {
dd, err := device.toDockerDevice()
Expand Down Expand Up @@ -972,6 +951,40 @@ func (d *Driver) createContainerConfig(task *drivers.TaskConfig, driverConfig *T
hostConfig.Mounts = append(hostConfig.Mounts, hm)
}

// Setup DNS
// If task DNS options are configured Nomad will manage the resolv.conf file
// Docker driver dns options are not compatible with task dns options
if task.DNS != nil {
dnsMount, err := resolvconf.GenerateDNSMount(task.TaskDir().Dir, task.DNS)
if err != nil {
return c, fmt.Errorf("failed to build mount for resolv.conf: %v", err)
}
hostConfig.Mounts = append(hostConfig.Mounts, docker.HostMount{
Target: dnsMount.TaskPath,
Source: dnsMount.HostPath,
Type: "bind",
ReadOnly: dnsMount.Readonly,
BindOptions: &docker.BindOptions{
Propagation: dnsMount.PropagationMode,
},
})
} else {
if len(driverConfig.DNSSearchDomains) > 0 {
hostConfig.DNSSearch = driverConfig.DNSSearchDomains
}
if len(driverConfig.DNSOptions) > 0 {
hostConfig.DNSOptions = driverConfig.DNSOptions
}
// set DNS servers
for _, ip := range driverConfig.DNSServers {
if net.ParseIP(ip) != nil {
hostConfig.DNS = append(hostConfig.DNS, ip)
} else {
logger.Error("invalid ip address for container dns server", "ip", ip)
}
}
}

for _, m := range task.Mounts {
hm := docker.HostMount{
Type: "bind",
Expand Down
49 changes: 35 additions & 14 deletions drivers/docker/driver_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1337,25 +1337,46 @@ func TestDockerDriver_DNS(t *testing.T) {
t.Parallel()
}
testutil.DockerCompatible(t)
testutil.ExecCompatible(t)

task, cfg, ports := dockerTask(t)
defer freeport.Return(ports)
cfg.DNSServers = []string{"8.8.8.8", "8.8.4.4"}
cfg.DNSSearchDomains = []string{"example.com", "example.org", "example.net"}
cfg.DNSOptions = []string{"ndots:1"}
require.NoError(t, task.EncodeConcreteDriverConfig(cfg))
cases := []struct {
name string
cfg *drivers.DNSConfig
}{
{
name: "nil DNSConfig",
},
{
name: "basic",
cfg: &drivers.DNSConfig{
Servers: []string{"1.1.1.1", "1.0.0.1"},
},
},
{
name: "full",
cfg: &drivers.DNSConfig{
Servers: []string{"1.1.1.1", "1.0.0.1"},
Searches: []string{"local.test", "node.consul"},
Options: []string{"ndots:2", "edns0"},
},
},
}

client, d, handle, cleanup := dockerSetup(t, task, nil)
defer cleanup()
for _, c := range cases {
task, cfg, ports := dockerTask(t)
defer freeport.Return(ports)
task.DNS = c.cfg
require.NoError(t, task.EncodeConcreteDriverConfig(cfg))

require.NoError(t, d.WaitUntilStarted(task.ID, 5*time.Second))
_, d, _, cleanup := dockerSetup(t, task, nil)
defer cleanup()

container, err := client.InspectContainer(handle.containerID)
require.NoError(t, err)
require.NoError(t, d.WaitUntilStarted(task.ID, 5*time.Second))
defer d.DestroyTask(task.ID, true)

dtestutil.TestTaskDNSConfig(t, d, task.ID, c.cfg)
}

require.Exactly(t, cfg.DNSServers, container.HostConfig.DNS)
require.Exactly(t, cfg.DNSSearchDomains, container.HostConfig.DNSSearch)
require.Exactly(t, cfg.DNSOptions, container.HostConfig.DNSOptions)
}

func TestDockerDriver_MemoryHardLimit(t *testing.T) {
Expand Down