diff options
| -rw-r--r-- | cmd/podman/common/completion.go | 1 | ||||
| -rw-r--r-- | docs/source/markdown/podman-create.1.md | 1 | ||||
| -rw-r--r-- | docs/source/markdown/podman-run.1.md | 1 | ||||
| -rw-r--r-- | libpod/networking_linux.go | 14 | ||||
| -rw-r--r-- | test/e2e/run_networking_test.go | 7 |
5 files changed, 22 insertions, 2 deletions
diff --git a/cmd/podman/common/completion.go b/cmd/podman/common/completion.go index c9a3c5e94..09dd74e20 100644 --- a/cmd/podman/common/completion.go +++ b/cmd/podman/common/completion.go @@ -817,6 +817,7 @@ func AutocompleteNetworkFlag(cmd *cobra.Command, args []string, toComplete strin "allow_host_loopback=": getBoolCompletion, "cidr=": nil, "enable_ipv6=": getBoolCompletion, + "mtu=": nil, "outbound_addr=": nil, "outbound_addr6=": nil, "port_handler=": func(_ string) ([]string, cobra.ShellCompDirective) { diff --git a/docs/source/markdown/podman-create.1.md b/docs/source/markdown/podman-create.1.md index 8deaa8540..02eeb557c 100644 --- a/docs/source/markdown/podman-create.1.md +++ b/docs/source/markdown/podman-create.1.md @@ -635,6 +635,7 @@ Valid _mode_ values are: - **private**: create a new namespace for the container (default) - **slirp4netns[:OPTIONS,...]**: use **slirp4netns**(1) to create a user network stack. This is the default for rootless containers. It is possible to specify these additional options: - **allow_host_loopback=true|false**: Allow the slirp4netns to reach the host loopback IP (`10.0.2.2`). Default is false. + - **mtu=MTU**: Specify the MTU to use for this network. (Default is `65520`). - **cidr=CIDR**: Specify ip range to use for this network. (Default is `10.0.2.0/24`). - **enable_ipv6=true|false**: Enable IPv6. Default is false. (Required for `outbound_addr6`). - **outbound_addr=INTERFACE**: Specify the outbound interface slirp should bind to (ipv4 traffic only). diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md index 74c231184..edcd63935 100644 --- a/docs/source/markdown/podman-run.1.md +++ b/docs/source/markdown/podman-run.1.md @@ -671,6 +671,7 @@ Valid _mode_ values are: - **private**: create a new namespace for the container (default) - **slirp4netns[:OPTIONS,...]**: use **slirp4netns**(1) to create a user network stack. This is the default for rootless containers. It is possible to specify these additional options: - **allow_host_loopback=true|false**: Allow the slirp4netns to reach the host loopback IP (`10.0.2.2`). Default is false. + - **mtu=MTU**: Specify the MTU to use for this network. (Default is `65520`). - **cidr=CIDR**: Specify ip range to use for this network. (Default is `10.0.2.0/24`). - **enable_ipv6=true|false**: Enable IPv6. Default is false. (Required for `outbound_addr6`). - **outbound_addr=INTERFACE**: Specify the outbound interface slirp should bind to (ipv4 traffic only). diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go index ffd39dfa9..2eabec634 100644 --- a/libpod/networking_linux.go +++ b/libpod/networking_linux.go @@ -15,6 +15,7 @@ import ( "path/filepath" "regexp" "sort" + "strconv" "strings" "syscall" "time" @@ -42,6 +43,9 @@ const ( // slirp4netnsDNS is the IP for the built-in DNS server in the slirp network slirp4netnsDNS = "10.0.2.3" + + // slirp4netnsMTU the default MTU override + slirp4netnsMTU = 65520 ) // Get an OCICNI network config @@ -282,6 +286,7 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { enableIPv6 := false outboundAddr := "" outboundAddr6 := "" + mtu := slirp4netnsMTU if ctr.config.NetworkOptions != nil { slirpOptions = append(slirpOptions, ctr.config.NetworkOptions["slirp4netns"]...) @@ -345,6 +350,11 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { } } outboundAddr6 = value + case "mtu": + mtu, err = strconv.Atoi(value) + if mtu < 68 || err != nil { + return errors.Errorf("invalid mtu %q", value) + } default: return errors.Errorf("unknown option for slirp4netns: %q", o) } @@ -358,8 +368,8 @@ func (r *Runtime) setupSlirp4netns(ctr *Container) error { if disableHostLoopback && slirpFeatures.HasDisableHostLoopback { cmdArgs = append(cmdArgs, "--disable-host-loopback") } - if slirpFeatures.HasMTU { - cmdArgs = append(cmdArgs, "--mtu", "65520") + if mtu > -1 && slirpFeatures.HasMTU { + cmdArgs = append(cmdArgs, fmt.Sprintf("--mtu=%d", mtu)) } if !noPivotRoot && slirpFeatures.HasEnableSandbox { cmdArgs = append(cmdArgs, "--enable-sandbox") diff --git a/test/e2e/run_networking_test.go b/test/e2e/run_networking_test.go index ebea2132a..676f24e5d 100644 --- a/test/e2e/run_networking_test.go +++ b/test/e2e/run_networking_test.go @@ -376,6 +376,13 @@ var _ = Describe("Podman run networking", func() { Expect(session.ExitCode()).To(Equal(0)) }) + It("podman run slirp4netns network with mtu", func() { + session := podmanTest.Podman([]string{"run", "--network", "slirp4netns:mtu=9000", ALPINE, "ip", "addr"}) + session.Wait(30) + Expect(session.ExitCode()).To(Equal(0)) + Expect(session.OutputToString()).To(ContainSubstring("mtu 9000")) + }) + It("podman run slirp4netns network with different cidr", func() { slirp4netnsHelp := SystemExec("slirp4netns", []string{"--help"}) Expect(slirp4netnsHelp.ExitCode()).To(Equal(0)) |