Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Added checks for br_netfilter module #2082

Merged
merged 1 commit into from
Oct 21, 2024
Merged

Added checks for br_netfilter module #2082

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,8 @@ curl -O -L https://github.com/containernetworking/plugins/releases/download/v1.5
tar -C /opt/cni/bin -xzf cni-plugins-linux-$ARCH-v1.5.1.tgz
```

Flannel requires the br_netfilter module to start and from version 1.30 kubeadm doesn't check if the module is installed and Flannel will not rightly start in case the module is missing.

## Getting started on Docker

flannel is also widely used outside of kubernetes. When deployed outside of kubernetes, etcd is always used as the datastore. For more details integrating flannel with Docker see [Running](Documentation/running.md)
Expand Down
14 changes: 14 additions & 0 deletions main.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -261,6 +261,20 @@ func main() {
os.Exit(1)
}

// From Kubernetes 1.30 kubeadm doesn't check if the br_netfilter module is loaded and in case it's missing Flannel wrongly starts
if config.EnableIPv4 {
if _, err = os.Stat("/proc/sys/net/bridge/bridge-nf-call-iptables"); os.IsNotExist(err) {
log.Error("Failed to check br_netfilter: ", err)
os.Exit(1)
}
}
if config.EnableIPv6 {
if _, err = os.Stat("/proc/sys/net/bridge/bridge-nf-call-ip6tables"); os.IsNotExist(err) {
log.Error("Failed to check br_netfilter: ", err)
os.Exit(1)
}
}

// Work out which interface to use
var extIface *backend.ExternalInterface

Expand Down
Loading