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runtime: correctly detect IPv4 forwarding

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When memory cgroup is absent, there was not attempt to detect if IPv4
forwarding was enabled and therefore, docker was printing a warning
for each command spawning a new container. The test for IPv4
forwarding was guarded by the test for memory cgroup.
This commit is contained in:
Vincent Bernat 2013-08-11 11:52:16 +02:00
parent 940d58806c
commit 64b817a5c1
1 changed files with 5 additions and 5 deletions
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10
runtime.go
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@ -241,12 +241,12 @@ func (runtime *Runtime) UpdateCapabilities(quiet bool) {
if !runtime.capabilities.SwapLimit && !quiet { if !runtime.capabilities.SwapLimit && !quiet {
log.Printf("WARNING: Your kernel does not support cgroup swap limit.") log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
} }
}
content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward") content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
runtime.capabilities.IPv4Forwarding = err3 == nil && len(content) > 0 && content[0] == '1' runtime.capabilities.IPv4Forwarding = err3 == nil && len(content) > 0 && content[0] == '1'
if !runtime.capabilities.IPv4Forwarding && !quiet { if !runtime.capabilities.IPv4Forwarding && !quiet {
log.Printf("WARNING: IPv4 forwarding is disabled.") log.Printf("WARNING: IPv4 forwarding is disabled.")
}
} }
} }