435 lines
8.3 KiB
Markdown
435 lines
8.3 KiB
Markdown
# CRI-O Tutorial
|
|
|
|
This tutorial will walk you through the installation of [CRI-O](https://github.com/kubernetes-incubator/cri-o), an Open Container Initiative-based implementation of [Kubernetes Container Runtime Interface](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/container-runtime-interface-v1.md), and the creation of [Redis](https://redis.io/) server running in a [Pod](http://kubernetes.io/docs/user-guide/pods/).
|
|
|
|
## Prerequisites
|
|
|
|
A Linux machine is required to download and build the `CRI-O` components and run the commands in this tutorial.
|
|
|
|
Create a machine running Ubuntu 16.10:
|
|
|
|
```
|
|
gcloud compute instances create cri-o \
|
|
--machine-type n1-standard-2 \
|
|
--image-family ubuntu-1610 \
|
|
--image-project ubuntu-os-cloud
|
|
```
|
|
|
|
SSH into the machine:
|
|
|
|
```
|
|
gcloud compute ssh cri-o
|
|
```
|
|
|
|
## Installation
|
|
|
|
This section will walk you through installing the following components:
|
|
|
|
* crio - The implementation of the Kubernetes CRI, which manages Pods.
|
|
* crictl - The CRI client for testing.
|
|
* cni - The Container Network Interface
|
|
* runc - The OCI runtime to launch the container
|
|
|
|
|
|
### runc
|
|
|
|
Download the `runc` release binary:
|
|
|
|
```
|
|
wget https://github.com/opencontainers/runc/releases/download/v1.0.0-rc4/runc.amd64
|
|
```
|
|
|
|
Set the executable bit and copy the `runc` binary into your PATH:
|
|
|
|
```
|
|
chmod +x runc.amd64
|
|
```
|
|
|
|
```
|
|
sudo mv runc.amd64 /usr/bin/runc
|
|
```
|
|
|
|
Print the `runc` version:
|
|
|
|
```
|
|
runc -version
|
|
```
|
|
```
|
|
runc version 1.0.0-rc4
|
|
commit: 2e7cfe036e2c6dc51ccca6eb7fa3ee6b63976dcd
|
|
spec: 1.0.0
|
|
```
|
|
|
|
### crio
|
|
|
|
The `crio` project does not ship binary releases so you'll need to build it from source.
|
|
|
|
#### Install the Go runtime and tool chain
|
|
|
|
Download the Go 1.8.5 binary release:
|
|
|
|
```
|
|
wget https://storage.googleapis.com/golang/go1.8.5.linux-amd64.tar.gz
|
|
```
|
|
|
|
Install Go 1.8.5:
|
|
|
|
```
|
|
sudo tar -xvf go1.8.5.linux-amd64.tar.gz -C /usr/local/
|
|
```
|
|
|
|
```
|
|
mkdir -p $HOME/go/src
|
|
```
|
|
|
|
```
|
|
export GOPATH=$HOME/go
|
|
```
|
|
|
|
```
|
|
export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin
|
|
```
|
|
|
|
At this point the Go 1.8.5 tool chain should be installed:
|
|
|
|
```
|
|
go version
|
|
```
|
|
|
|
```
|
|
go version go1.8.5 linux/amd64
|
|
```
|
|
|
|
#### Get crictl
|
|
|
|
```
|
|
go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
|
|
```
|
|
|
|
#### Build crio from source
|
|
|
|
```
|
|
sudo apt-get update && apt-get install -y libglib2.0-dev \
|
|
libseccomp-dev \
|
|
libapparmor-dev \
|
|
libgpgme11-dev \
|
|
libdevmapper-dev \
|
|
make \
|
|
git
|
|
```
|
|
|
|
```
|
|
go get -d github.com/kubernetes-incubator/cri-o
|
|
```
|
|
|
|
```
|
|
cd $GOPATH/src/github.com/kubernetes-incubator/cri-o
|
|
```
|
|
|
|
```
|
|
make install.tools
|
|
```
|
|
|
|
```
|
|
make
|
|
```
|
|
|
|
```
|
|
sudo make install
|
|
```
|
|
|
|
If you are installing for the first time, generate and install configuration files with:
|
|
|
|
```
|
|
sudo make install.config
|
|
```
|
|
|
|
#### Start the crio system daemon
|
|
|
|
```
|
|
sudo sh -c 'echo "[Unit]
|
|
Description=OCI-based implementation of Kubernetes Container Runtime Interface
|
|
Documentation=https://github.com/kubernetes-incubator/cri-o
|
|
|
|
[Service]
|
|
ExecStart=/usr/local/bin/crio --log-level debug
|
|
Restart=on-failure
|
|
RestartSec=5
|
|
|
|
[Install]
|
|
WantedBy=multi-user.target" > /etc/systemd/system/crio.service'
|
|
```
|
|
|
|
```
|
|
sudo systemctl daemon-reload
|
|
```
|
|
```
|
|
sudo systemctl enable crio
|
|
```
|
|
```
|
|
sudo systemctl start crio
|
|
```
|
|
|
|
#### Ensure the crio service is running
|
|
|
|
```
|
|
sudo crictl --runtime-endpoint /var/run/crio/crio.sock info
|
|
```
|
|
```
|
|
Version: 0.1.0
|
|
RuntimeName: cri-o
|
|
RuntimeVersion: 1.10.0-dev
|
|
RuntimeApiVersion: v1alpha1
|
|
```
|
|
|
|
> to avoid set --runtime-endpoint when call crictl,
|
|
> you can export $CRI_RUNTIME_ENDPOINT=/var/run/crio/crio.sock
|
|
> or cp crictl.yaml /etc/crictl.yaml from this repo
|
|
|
|
### CNI plugins
|
|
|
|
This tutorial will use the latest version of `CNI` plugins from the master branch and build it from source.
|
|
|
|
Download the `CNI` plugins source tree:
|
|
|
|
```
|
|
go get -d github.com/containernetworking/plugins
|
|
```
|
|
|
|
```
|
|
cd $GOPATH/src/github.com/containernetworking/plugins
|
|
```
|
|
|
|
Build the `CNI` plugins:
|
|
|
|
```
|
|
./build.sh
|
|
```
|
|
|
|
Output:
|
|
|
|
```
|
|
Building API
|
|
Building reference CLI
|
|
Building plugins
|
|
flannel
|
|
tuning
|
|
bridge
|
|
ipvlan
|
|
loopback
|
|
macvlan
|
|
ptp
|
|
dhcp
|
|
host-local
|
|
noop
|
|
```
|
|
|
|
Install the `CNI` plugins:
|
|
|
|
```
|
|
sudo mkdir -p /opt/cni/bin
|
|
```
|
|
|
|
```
|
|
sudo cp bin/* /opt/cni/bin/
|
|
```
|
|
|
|
#### Configure CNI
|
|
|
|
```
|
|
sudo mkdir -p /etc/cni/net.d
|
|
```
|
|
|
|
```
|
|
sudo sh -c 'cat >/etc/cni/net.d/10-mynet.conf <<-EOF
|
|
{
|
|
"cniVersion": "0.2.0",
|
|
"name": "mynet",
|
|
"type": "bridge",
|
|
"bridge": "cni0",
|
|
"isGateway": true,
|
|
"ipMasq": true,
|
|
"ipam": {
|
|
"type": "host-local",
|
|
"subnet": "10.88.0.0/16",
|
|
"routes": [
|
|
{ "dst": "0.0.0.0/0" }
|
|
]
|
|
}
|
|
}
|
|
EOF'
|
|
```
|
|
|
|
```
|
|
sudo sh -c 'cat >/etc/cni/net.d/99-loopback.conf <<-EOF
|
|
{
|
|
"cniVersion": "0.2.0",
|
|
"type": "loopback"
|
|
}
|
|
EOF'
|
|
```
|
|
|
|
Install `skopeo-containers` package from `ppa:projectatomic/ppa`
|
|
|
|
```
|
|
sudo add-apt-repository ppa:projectatomic/ppa
|
|
sudo apt-get update
|
|
sudo apt-get install skopeo-containers -y
|
|
```
|
|
|
|
Restart crio in order to apply CNI config
|
|
|
|
```
|
|
systemctl restart crio
|
|
```
|
|
|
|
At this point `CNI` is installed and configured to allocation IP address to containers from the `10.88.0.0/16` subnet.
|
|
|
|
## Pod Tutorial
|
|
|
|
Now that the `CRI-O` components have been installed and configured we are ready to create a Pod. This section will walk you through launching a Redis server in a Pod. Once the Redis server is running we'll use telnet to verify it's working, then we'll stop the Redis server and clean up the Pod.
|
|
|
|
### Creating a Pod
|
|
|
|
First we need to setup a Pod sandbox using a Pod configuration, which can be found in the `cri-o` source tree:
|
|
|
|
```
|
|
cd $GOPATH/src/github.com/kubernetes-incubator/cri-o
|
|
```
|
|
|
|
Next create the Pod and capture the Pod ID for later use:
|
|
|
|
```
|
|
POD_ID=$(sudo crictl runp test/testdata/sandbox_config.json)
|
|
```
|
|
|
|
> sudo crictl runp test/testdata/sandbox_config.json
|
|
|
|
Use the `crictl` command to get the status of the Pod:
|
|
|
|
```
|
|
sudo crictl inspectp --output table $POD_ID
|
|
```
|
|
|
|
Output:
|
|
|
|
```
|
|
ID: cd6c0883663c6f4f99697aaa15af8219e351e03696bd866bc3ac055ef289702a
|
|
Name: podsandbox1
|
|
UID: redhat-test-crio
|
|
Namespace: redhat.test.crio
|
|
Attempt: 1
|
|
Status: SANDBOX_READY
|
|
Created: 2016-12-14 15:59:04.373680832 +0000 UTC
|
|
Network namespace: /var/run/netns/cni-bc37b858-fb4d-41e6-58b0-9905d0ba23f8
|
|
IP Address: 10.88.0.2
|
|
Labels:
|
|
group -> test
|
|
Annotations:
|
|
owner -> hmeng
|
|
security.alpha.kubernetes.io/seccomp/pod -> unconfined
|
|
security.alpha.kubernetes.io/sysctls -> kernel.shm_rmid_forced=1,net.ipv4.ip_local_port_range=1024 65000
|
|
security.alpha.kubernetes.io/unsafe-sysctls -> kernel.msgmax=8192
|
|
```
|
|
|
|
### Create a Redis container inside the Pod
|
|
|
|
Use the `crictl` command to pull the redis image, create a redis container from a container configuration and attach it to the Pod created earlier:
|
|
|
|
```
|
|
sudo crictl pull redis:alpine
|
|
CONTAINER_ID=$(sudo crictl create $POD_ID test/testdata/container_redis.json test/testdata/sandbox_config.json)
|
|
```
|
|
|
|
> sudo crictl create $POD_ID test/testdata/container_redis.json test/testdata/sandbox_config.json
|
|
|
|
The `crictl create` command will take a few seconds to return because the redis container needs to be pulled.
|
|
|
|
Start the Redis container:
|
|
|
|
```
|
|
sudo crictl start $CONTAINER_ID
|
|
```
|
|
|
|
Get the status for the Redis container:
|
|
|
|
```
|
|
sudo crictl inspect $CONTAINER_ID
|
|
```
|
|
|
|
Output:
|
|
|
|
```
|
|
ID: d0147eb67968d81aaddbccc46cf1030211774b5280fad35bce2fdb0a507a2e7a
|
|
Name: podsandbox1-redis
|
|
Status: CONTAINER_RUNNING
|
|
Created: 2016-12-14 16:00:42.889089352 +0000 UTC
|
|
Started: 2016-12-14 16:01:56.733704267 +0000 UTC
|
|
```
|
|
|
|
### Test the Redis container
|
|
|
|
Connect to the Pod IP on port 6379:
|
|
|
|
```
|
|
telnet 10.88.0.2 6379
|
|
```
|
|
|
|
```
|
|
Trying 10.88.0.2...
|
|
Connected to 10.88.0.2.
|
|
Escape character is '^]'.
|
|
```
|
|
|
|
At the prompt type `MONITOR`:
|
|
|
|
```
|
|
Trying 10.88.0.2...
|
|
Connected to 10.88.0.2.
|
|
Escape character is '^]'.
|
|
MONITOR
|
|
+OK
|
|
```
|
|
|
|
Exit the telnet session by typing `ctrl-]` and `quit` at the prompt:
|
|
|
|
```
|
|
^]
|
|
|
|
telnet> quit
|
|
Connection closed.
|
|
```
|
|
|
|
#### Viewing the Redis logs
|
|
|
|
The Redis logs are logged to the stderr of the crio service, which can be viewed using `journalctl`:
|
|
|
|
```
|
|
sudo journalctl -u crio --no-pager
|
|
```
|
|
|
|
### Stop the redis container and delete the Pod
|
|
|
|
```
|
|
sudo crictl stop $CONTAINER_ID
|
|
```
|
|
|
|
```
|
|
sudo crictl rm $CONTAINER_ID
|
|
```
|
|
|
|
```
|
|
sudo crictl stopp $POD_ID
|
|
```
|
|
|
|
```
|
|
sudo crictl rmp $POD_ID
|
|
```
|
|
|
|
```
|
|
sudo crictl pods
|
|
```
|
|
|
|
```
|
|
sudo crictl ps
|
|
```
|