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detect ip6tables setup failure and fallback to ipv4 only

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This commit is contained in:
Benjamin Elder
2024-10-04 13:12:50 -07:00
parent 874ab2ff12
commit 43c99ea29c
1 changed files with 11 additions and 1 deletions
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12
pkg/cluster/internal/providers/docker/network.go
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@@ -261,7 +261,17 @@ func checkIfNetworkExists(name string) (bool, error) {
func isIPv6UnavailableError(err error) bool {
rerr := exec.RunErrorForError(err)
return rerr != nil && strings.HasPrefix(string(rerr.Output), "Error response from daemon: Cannot read IPv6 setup for bridge")
if rerr == nil {
return false
}
errorMessage := string(rerr.Output)
// we get this error when ipv6 was disabled in docker
const dockerIPV6DisabledError = "Error response from daemon: Cannot read IPv6 setup for bridge"
// TODO: this is fragile, and only necessary due to docker enabling ipv6 by default
// even on hosts that lack ip6tables setup.
// Preferably users would either have ip6tables setup properly or else disable ipv6 in docker
const dockerIPV6TablesError = "Error response from daemon: Failed to Setup IP tables: Unable to enable NAT rule: (iptables failed: ip6tables"
return strings.HasPrefix(errorMessage, dockerIPV6DisabledError) || strings.HasPrefix(errorMessage, dockerIPV6TablesError)
}
func isPoolOverlapError(err error) bool {