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Use Calico instead of Flannel
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1. Download and modify the Calico descriptor
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2. Create the cluster without flannel and with calico
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Feature Comparison: v1 vs. v3
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1. Download and modify the Calico descriptor
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References
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< h1 id = "use-calico-instead-of-flannel" > Use Calico instead of Flannel< a class = "headerlink" href = "#use-calico-instead-of-flannel" title = "Permanent link" > ¶ < / a > < / h1 >
< p > If you want to use NetworkPolicy you can use Calico in k3s instead of Flannel.< / p >
< h3 id = "1-download-and-modify-the-calico-descriptor" > 1. Download and modify the Calico descriptor< a class = "headerlink" href = "#1-download-and-modify-the-calico-descriptor" title = "Permanent link" > ¶ < / a > < / h3 >
< p > You can following the < a href = "https://docs.projectcalico.org/master/reference/cni-plugin/configuration" > documentation< / a > < / p >
< p > And then you have to change the ConfigMap < code > calico-config< / code > . On the < code > cni_network_config< / code > add the entry for allowing IP forwarding< br / >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > " container_settings" < / span > < span class = "p" > :< / span > < span class = "p" > {< / span >
< span class = "nt" > " allow_ip_forwarding" < / span > < span class = "p" > :< / span > < span class = "kc" > true< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div >
Or you can directly use this < a href = "../calico.yaml" > calico.yaml< / a > manifest< / p >
< h2 id = "2-create-the-cluster-without-flannel-and-with-calico" > 2. Create the cluster without flannel and with calico< a class = "headerlink" href = "#2-create-the-cluster-without-flannel-and-with-calico" title = "Permanent link" > ¶ < / a > < / h2 >
< p > On the k3s cluster creation :
- add the flag < code > --flannel-backend=none< / code > . For this, on k3d you need to forward this flag to k3s with the option < code > --k3s-server-arg< / code > .
- mount (< code > --volume< / code > ) the calico descriptor in the auto deploy manifest directory of k3s < code > /var/lib/rancher/k3s/server/manifests/< / code > < / p >
< p > So the command of the cluster creation is (when you are at root of the k3d repository)
< div class = "highlight" > < pre > < span > < / span > < code > k3d cluster create < span class = "s2" > " < / span > < span class = "si" > ${< / span > < span class = "nv" > clustername< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > --k3s-server-arg < span class = "s1" > ' --flannel-backend=none' < / span > --volume < span class = "s2" > " < / span > < span class = "k" > $(< / span > < span class = "nb" > pwd< / span > < span class = "k" > )< / span > < span class = "s2" > /docs/usage/guides/calico.yaml:/var/lib/rancher/k3s/server/manifests/calico.yaml" < / span >
< / code > < / pre > < / div >
In this example :
- change < code > "${clustername}"< / code > with the name of the cluster (or set a variable).
- < code > $(pwd)/docs/usage/guides/calico.yaml< / code > is the absolute path of the calico manifest, you can adapt it.< / p >
< p > You can add other options, < a href = "../../commands/" > see< / a > . < / p >
< p > The cluster will start without flannel and with Calico as CNI Plugin.< / p >
< p > For watching for the pod(s) deployment
< div class = "highlight" > < pre > < span > < / span > < code > watch < span class = "s2" > " kubectl get pods -n kube-system" < / span >
< / code > < / pre > < / div > < / p >
< p > You will have something like this at beginning (with the command line < code > kubectl get pods -n kube-system< / code > )
< div class = "highlight" > < pre > < span > < / span > < code > NAME READY STATUS RESTARTS AGE
helm-install-traefik-pn84f 0/1 Pending 0 3s
calico-node-97rx8 0/1 Init:0/3 0 3s
metrics-server-7566d596c8-hwnqq 0/1 Pending 0 2s
calico-kube-controllers-58b656d69f-2z7cn 0/1 Pending 0 2s
local-path-provisioner-6d59f47c7-rmswg 0/1 Pending 0 2s
coredns-8655855d6-cxtnr 0/1 Pending 0 2s
< / code > < / pre > < / div > < / p >
< p > And when it finish to start
< div class = "highlight" > < pre > < span > < / span > < code > NAME READY STATUS RESTARTS AGE
metrics-server-7566d596c8-hwnqq 1/1 Running 0 56s
calico-node-97rx8 1/1 Running 0 57s
helm-install-traefik-pn84f 0/1 Completed 1 57s
svclb-traefik-lmjr5 2/2 Running 0 28s
calico-kube-controllers-58b656d69f-2z7cn 1/1 Running 0 56s
local-path-provisioner-6d59f47c7-rmswg 1/1 Running 0 56s
traefik-758cd5fc85-x8p57 1/1 Running 0 28s
coredns-8655855d6-cxtnr 1/1 Running 0 56s
< / code > < / pre > < / div > < / p >
< p > Note :
- you can use the auto deploy manifest or a kubectl apply depending on your needs
- < !> Calico is not as quick as Flannel (but it provides more features)< / p >
< h2 id = "references" > References< a class = "headerlink" href = "#references" title = "Permanent link" > ¶ < / a > < / h2 >
< p > https://rancher.com/docs/k3s/latest/en/installation/network-options/< br / >
https://docs.projectcalico.org/getting-started/kubernetes/k3s/< / p >
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