Fix: hostname not populated for /etc/hosts in bridge networks.

Signed-off-by: Shishir Mahajan <[email protected]>

Author: shishir-a412ed

containerd/containerd.go

@@ -31,6 +31,8 @@ import (
 	refdocker "github.com/containerd/containerd/reference/docker"
 	remotesdocker "github.com/containerd/containerd/remotes/docker"
 	"github.com/docker/go-units"
+	"github.com/hashicorp/nomad/drivers/shared/hostnames"
+	"github.com/hashicorp/nomad/plugins/drivers"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 )
 
@@ -114,7 +116,7 @@ func (d *Driver) pullImage(imageName, imagePullTimeout string, auth *RegistryAut
 	return d.client.Pull(ctxWithTimeout, named.String(), pullOpts...)
 }
 
-func (d *Driver) createContainer(containerConfig *ContainerConfig, config *TaskConfig) (containerd.Container, error) {
+func (d *Driver) createContainer(containerConfig *ContainerConfig, config *TaskConfig, cfg *drivers.TaskConfig) (containerd.Container, error) {
 	if config.Command != "" && config.Entrypoint != nil {
 		return nil, fmt.Errorf("Both command and entrypoint are set. Only one of them needs to be set.")
 	}
@@ -198,13 +200,6 @@ func (d *Driver) createContainer(containerConfig *ContainerConfig, config *TaskC
 		opts = append(opts, oci.WithRootFSReadonly())
 	}
 
-	// Enable host network.
-	// WithHostHostsFile bind-mounts the host's /etc/hosts into the container as readonly.
-	// WithHostResolvconf bind-mounts the host's /etc/resolv.conf into the container as readonly.
-	if config.HostNetwork {
-		opts = append(opts, oci.WithHostNamespace(specs.NetworkNamespace), oci.WithHostHostsFile, oci.WithHostResolvconf)
-	}
-
 	// Add capabilities.
 	if len(config.CapAdd) > 0 {
 		opts = append(opts, oci.WithAddedCapabilities(config.CapAdd))
@@ -278,33 +273,37 @@ func (d *Driver) createContainer(containerConfig *ContainerConfig, config *TaskC
 		mounts = append(mounts, allocMount)
 	}
 
-	// User will specify extra_hosts to be added to container's /etc/hosts.
-	// If host_network=true, extra_hosts will be added to host's /etc/hosts.
-	// If host_network=false, extra hosts will be added to the default /etc/hosts provided to the container.
-	// If the user doesn't set anything (host_network, extra_hosts), a default /etc/hosts will be provided to the container.
-	var extraHostsMount specs.Mount
+	var etcHostMount specs.Mount
 	hostsFile := containerConfig.TaskDirSrc + "/etc_hosts"
-	if len(config.ExtraHosts) > 0 {
-		if config.HostNetwork {
-			if err := etchosts.CopyEtcHosts(hostsFile); err != nil {
-				return nil, err
-			}
-		} else {
-			if err := etchosts.BuildEtcHosts(hostsFile); err != nil {
-				return nil, err
-			}
+	if config.HostNetwork {
+		opts = append(opts, oci.WithHostNamespace(specs.NetworkNamespace), oci.WithHostHostsFile, oci.WithHostResolvconf)
+		if err := etchosts.CopyEtcHosts(hostsFile); err != nil {
+			return nil, err
 		}
 		if err := etchosts.AddExtraHosts(hostsFile, config.ExtraHosts); err != nil {
 			return nil, err
 		}
-		extraHostsMount = buildMountpoint("bind", "/etc/hosts", hostsFile, []string{"rbind", "rw"})
-		mounts = append(mounts, extraHostsMount)
-	} else if !config.HostNetwork {
+		etcHostMount = buildMountpoint("bind", "/etc/hosts", hostsFile, []string{"rbind", "rw"})
+		mounts = append(mounts, etcHostMount)
+	} else if cfg.NetworkIsolation != nil {
+		mountInfo, err := hostnames.GenerateEtcHostsMount(
+			cfg.TaskDir().Dir, cfg.NetworkIsolation, config.ExtraHosts)
+		if err != nil {
+			return nil, fmt.Errorf("failed to build mount for /etc/hosts: %v", err)
+		}
+		if mountInfo != nil {
+			etcHostMount = buildMountpoint("bind", mountInfo.TaskPath, mountInfo.HostPath, []string{"rbind", "rw"})
+			mounts = append(mounts, etcHostMount)
+		}
+	} else {
 		if err := etchosts.BuildEtcHosts(hostsFile); err != nil {
 			return nil, err
 		}
-		extraHostsMount = buildMountpoint("bind", "/etc/hosts", hostsFile, []string{"rbind", "rw"})
-		mounts = append(mounts, extraHostsMount)
+		if err := etchosts.AddExtraHosts(hostsFile, config.ExtraHosts); err != nil {
+			return nil, err
+		}
+		etcHostMount = buildMountpoint("bind", "/etc/hosts", hostsFile, []string{"rbind", "rw"})
+		mounts = append(mounts, etcHostMount)
 	}
 
 	if len(mounts) > 0 {

containerd/driver.go

@@ -467,7 +467,7 @@ func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drive
 	containerConfig.MemoryHardLimit = cfg.Resources.NomadResources.Memory.MemoryMaxMB * 1024 * 1024
 	containerConfig.CPUShares = cfg.Resources.LinuxResources.CPUShares
 
-	container, err := d.createContainer(&containerConfig, &driverConfig)
+	container, err := d.createContainer(&containerConfig, &driverConfig, cfg)
 	if err != nil {
 		return nil, nil, fmt.Errorf("Error in creating container: %v", err)
 	}

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/hashicorp/go-envparse v0.0.0-20190703193109-150b3a2a4611 // indirect
 	github.com/hashicorp/go-hclog v0.14.1
 	github.com/hashicorp/go-uuid v1.0.1
-	github.com/hashicorp/nomad v1.1.0
+	github.com/hashicorp/nomad v1.1.2
 	github.com/opencontainers/runtime-spec v1.0.3-0.20200929063507-e6143ca7d51d
 	github.com/spf13/cobra v1.1.1
 )

go.sum

@@ -94,6 +94,7 @@ github.com/Shopify/logrus-bugsnag v0.0.0-20171204204709-577dee27f20d/go.mod h1:H
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUWq3EgK3CesDbo8upS2Vm9/P3FtgI+Jk=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
+github.com/VividCortex/ewma v1.1.1/go.mod h1:2Tkkvm3sRDVXaiyucHiACn4cqf7DpdyLvmxzcbUokwA=
 github.com/abdullin/seq v0.0.0-20160510034733-d5467c17e7af/go.mod h1:5Jv4cbFiHJMsVxt52+i0Ha45fjshj6wxYr1r19tB9bw=
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 github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
@@ -151,6 +152,7 @@ github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XL
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 github.com/cheggaaa/pb v1.0.27/go.mod h1:pQciLPpbU0oxA0h+VJYYLxO+XeDQb5pZijXscXHm81s=
+github.com/cheggaaa/pb/v3 v3.0.5/go.mod h1:X1L61/+36nz9bjIsrDU52qHKOQukUQe2Ge+YvGuquCw=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
@@ -408,6 +410,7 @@ github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5m
 github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTVRp3pOg5EKY=
 github.com/googleapis/gnostic v0.1.0/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTVRp3pOg5EKY=
 github.com/googleapis/gnostic v0.2.0/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTVRp3pOg5EKY=
+github.com/gookit/color v1.3.1/go.mod h1:R3ogXq2B9rTbXoSHJ1HyUVAZ3poOJHpd9nQmyGZsfvQ=
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@@ -419,6 +422,7 @@ github.com/gorilla/mux v1.7.4/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB7
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@@ -448,6 +452,8 @@ github.com/hashicorp/go-checkpoint v0.0.0-20171009173528-1545e56e46de/go.mod h1:
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+github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9neXJWAZQ=
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@@ -460,6 +466,7 @@ github.com/hashicorp/go-gatedio v0.5.0 h1:Jm1X5yP4yCqqWj5L1TgW7iZwCVPGtVc+mro5r/
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@@ -526,6 +533,8 @@ github.com/hashicorp/memberlist v0.2.2/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOn
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@@ -620,6 +629,7 @@ github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czP
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@@ -631,6 +641,7 @@ github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOA
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@@ -645,6 +656,7 @@ github.com/mitchellh/cli v1.1.0/go.mod h1:xcISNoH86gajksDmfB23e/pu+B+GeFRMYmoHXx
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@@ -654,9 +666,13 @@ github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77/go.
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@@ -797,6 +813,8 @@ github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
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+github.com/shirou/gopsutil/v3 v3.21.6-0.20210619153009-7ea8062810b6/go.mod h1:JfVbDpIBLVzT8oKbvMg9P3wEIMDDpVn+LwHTKj0ST88=
 github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4/go.mod h1:qsXQc7+bwAM3Q1u/4XEfrquwF8Lw7D7y5cD8CuHnfIc=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.0.4-0.20170822132746-89742aefa4b2/go.mod h1:pMByvHTf9Beacp5x1UXfOR9xyW/9antXMhjMPG0dEzc=
@@ -848,9 +866,12 @@ github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 h1:kdXcSzyDtse
 github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
 github.com/tencentcloud/tencentcloud-sdk-go v3.0.83+incompatible/go.mod h1:0PfYow01SHPMhKY31xa+EFz2RStxIqj6JFAJS+IkCi4=
 github.com/tent/http-link-go v0.0.0-20130702225549-ac974c61c2f9/go.mod h1:RHkNRtSLfOK7qBTHaeSX1D6BNpI3qw7NTxsmNr4RvN8=
+github.com/tj/go-spin v1.1.0/go.mod h1:Mg1mzmePZm4dva8Qz60H2lHwmJ2loum4VIrLgVnKwh4=
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 github.com/tklauser/go-sysconf v0.3.5/go.mod h1:MkWzOF4RMCshBAMXuhXJs64Rte09mITnppBXY/rYEFI=
+github.com/tklauser/go-sysconf v0.3.6 h1:oc1sJWvKkmvIxhDHeKWvZS4f6AW+YcoguSfRF2/Hmo4=
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 github.com/tklauser/numcpus v0.2.1/go.mod h1:9aU+wOc6WjUIZEwWMP62PL/41d65P+iks1gBkr4QyP8=
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@@ -926,6 +947,8 @@ golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200422194213-44a606286825/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
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+golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a h1:vclmkQCjlDX5OydZ9wv8rBCcS0QyQY66Mpf/7BZbInM=
+golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=