libnetwork fails to create bridge with docker 1.7.0 on CentOS / RHEL 6.6

[visualphoenix]

CentOS / RHEL 6.6 are supported platforms for docker. Libnetwork seems to fail creating the bridge interface on these hosts.

More info here: moby/moby#14024

[visualphoenix]

1.6.0 on 6.6 host shows the following:

veth                    4826  0
ipt_addrtype            2153  2
xt_conntrack            2776  1
iptable_filter          2793  1
ipt_MASQUERADE          2466  1
iptable_nat             6051  1
ip_tables              17831  2 iptable_filter,iptable_nat
nf_nat                 23316  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4       9506  4 iptable_nat,nf_nat
nf_conntrack           80390  5 xt_conntrack,ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4
nf_defrag_ipv4          1483  1 nf_conntrack_ipv4
bridge                 82775  0
stp                     2218  1 bridge
llc                     5578  2 bridge,stp

1.7.0 on 6.6 host shows the following:

iptable_nat             6051  0
ipt_addrtype            2153  0
ip_tables              17831  1 iptable_nat
nf_nat                 23316  1 iptable_nat
nf_conntrack_ipv4       9506  3 iptable_nat,nf_nat
nf_conntrack           80390  3 iptable_nat,nf_nat,nf_conntrack_ipv4
nf_defrag_ipv4          1483  1 nf_conntrack_ipv4
bridge                 82775  0
stp                     2218  1 bridge
llc                     5578  2 bridge,stp

[visualphoenix]

Not sure if the missing xt_conntrack,ipt_MASQUERADE are relavent in the latest libnetwork world, but wanted to highlight this difference.

[dave-tucker]

Closed by #315