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Compare to the correct host network setting

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In systemd-resolved hosts with no DNS customizations, the docker driver
DNS setting should be compared to /run/systemd/resolve/resolv.conf while
exec/java drivers should be compared to /etc/resolv.conf.

When system-resolved is enabled, /etc/resolv.conf is a stub that points
to 127.0.0.53. Docker avoids this stub because this address isn't
accessible from the container.  The exec/java drivers that don't create
network isolations use the stub though in the default configuration.
This commit is contained in:
Mahmood Ali 2020-09-30 13:25:01 -04:00
parent f4b0aa0c1c
commit 567597e108
1 changed files with 11 additions and 2 deletions
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13
plugins/drivers/testutils/dns_testing.go
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@ -16,7 +16,11 @@ func TestTaskDNSConfig(t *testing.T, driver *DriverHarness, taskID string, dns *
caps, err := driver.Capabilities()
require.NoError(t, err)
isolated := (caps.FSIsolation != drivers.FSIsolationNone)
// FS isolation is used here as a proxy for network isolation.
// This is true for the current built-in drivers but it is not necessarily so.
isolated := caps.FSIsolation != drivers.FSIsolationNone
usesHostNetwork := caps.FSIsolation != drivers.FSIsolationImage
if !isolated {
t.Skip("dns config not supported on non isolated drivers")
}
@ -39,7 +43,12 @@ func TestTaskDNSConfig(t *testing.T, driver *DriverHarness, taskID string, dns *
require.ElementsMatch(t, dns.Options, dresolvconf.GetOptions(resolvConf))
}
} else {
system, err := dresolvconf.Get()
systemPath := "/etc/resolv.conf"
if !usesHostNetwork {
systemPath = dresolvconf.Path()
}
system, err := dresolvconf.GetSpecific(systemPath)
require.NoError(t, err)
require.ElementsMatch(t, dresolvconf.GetNameservers(system.Content, dtypes.IP), dresolvconf.GetNameservers(resolvConf, dtypes.IP))
require.ElementsMatch(t, dresolvconf.GetSearchDomains(system.Content), dresolvconf.GetSearchDomains(resolvConf))