kubernetes-the-hard-way/docs/single-node-cluster.md

```
{
wget -q --show-progress --https-only --timestamping \
  https://storage.googleapis.com/kubernetes-the-hard-way/cfssl/1.4.1/linux/cfssl \
  https://storage.googleapis.com/kubernetes-the-hard-way/cfssl/1.4.1/linux/cfssljson
chmod +x cfssl cfssljson
sudo mv cfssl cfssljson /usr/local/bin/
}
```


```bash
{

cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "8760h"
    },
    "profiles": {
      "kubernetes": {
        "usages": ["signing", "key encipherment", "server auth", "client auth"],
        "expiry": "8760h"
      }
    }
  }
}
EOF

cat > ca-csr.json <<EOF
{
  "CN": "Kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "Kubernetes",
      "OU": "CA",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert -initca ca-csr.json | cfssljson -bare ca

}
```

Результат:
```
ca-key.pem
ca.csr
ca.pem
```

```bash
{

KUBERNETES_HOSTNAMES=kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local

cat > kubernetes-csr.json <<EOF
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "Kubernetes",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -hostname=worker,127.0.0.1,${KUBERNETES_HOSTNAMES} \
  -profile=kubernetes \
  kubernetes-csr.json | cfssljson -bare kubernetes

}
```

Завантажимо etcd
```
wget -q --show-progress --https-only --timestamping \
  "https://github.com/etcd-io/etcd/releases/download/v3.4.15/etcd-v3.4.15-linux-amd64.tar.gz"
```

Розпакувати і помістити etcd у диреторію /usr/local/bin/
```
{
  tar -xvf etcd-v3.4.15-linux-amd64.tar.gz
  sudo mv etcd-v3.4.15-linux-amd64/etcd* /usr/local/bin/
}
```

```
{
  sudo mkdir -p /etc/etcd /var/lib/etcd
  sudo chmod 700 /var/lib/etcd
  sudo cp ca.pem \
    kubernetes.pem kubernetes-key.pem \
    /etc/etcd/
}
```

```
cat <<EOF | sudo tee /etc/systemd/system/etcd.service
[Unit]
Description=etcd
Documentation=https://github.com/coreos

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd \\
  --name etcd \\
  --cert-file=/etc/etcd/kubernetes.pem \\
  --key-file=/etc/etcd/kubernetes-key.pem \\
  --trusted-ca-file=/etc/etcd/ca.pem \\
  --client-cert-auth \\
  --listen-client-urls https://127.0.0.1:2379 \\
  --advertise-client-urls https://127.0.0.1:2379 \\
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF
```

```bash
{
  sudo systemctl daemon-reload
  sudo systemctl enable etcd
  sudo systemctl start etcd
}
```

```
sudo ETCDCTL_API=3 etcdctl member list \
  --endpoints=https://127.0.0.1:2379 \
  --cacert=/etc/etcd/ca.pem \
  --cert=/etc/etcd/kubernetes.pem \
  --key=/etc/etcd/kubernetes-key.pem
```


api server

```bash
{
cat > service-account-csr.json <<EOF
{
  "CN": "service-accounts",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "Kubernetes",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  service-account-csr.json | cfssljson -bare service-account
}
```

```bash
{
cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "system:masters",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  admin-csr.json | cfssljson -bare admin
}
```

```
ENCRYPTION_KEY=$(head -c 32 /dev/urandom | base64)
```

```
cat > encryption-config.yaml <<EOF
kind: EncryptionConfig
apiVersion: v1
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: key1
              secret: ${ENCRYPTION_KEY}
      - identity: {}
EOF
```


```
sudo mkdir -p /etc/kubernetes/config
```

```
wget -q --show-progress --https-only --timestamping \
  "https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kube-apiserver"
```

```
{
  chmod +x kube-apiserver
  sudo mv kube-apiserver /usr/local/bin/
}
```

```
{
  sudo mkdir -p /var/lib/kubernetes/

  sudo cp \
    ca.pem \
    kubernetes.pem kubernetes-key.pem \
    encryption-config.yaml \
    service-account-key.pem service-account.pem \
    /var/lib/kubernetes/
}
```

```
sudo mkdir -p /etc/kubernetes/config
```


```
cat <<EOF | sudo tee /etc/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-apiserver \\
  --advertise-address='91.107.220.4' \\
  --allow-privileged='true' \\
  --apiserver-count='3' \\
  --audit-log-maxage='30' \\
  --audit-log-maxbackup='3' \\
  --audit-log-maxsize='100' \\
  --audit-log-path='/var/log/audit.log' \\
  --authorization-mode='Node,RBAC' \\
  --bind-address='0.0.0.0' \\
  --client-ca-file='/var/lib/kubernetes/ca.pem' \\
  --enable-admission-plugins='NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota' \\
  --etcd-cafile='/var/lib/kubernetes/ca.pem' \\
  --etcd-certfile='/var/lib/kubernetes/kubernetes.pem' \\
  --etcd-keyfile='/var/lib/kubernetes/kubernetes-key.pem' \\
  --etcd-servers='https://127.0.0.1:2379' \\
  --event-ttl='1h' \\
  --encryption-provider-config='/var/lib/kubernetes/encryption-config.yaml' \\
  --kubelet-certificate-authority='/var/lib/kubernetes/ca.pem' \\
  --kubelet-client-certificate='/var/lib/kubernetes/kubernetes.pem' \\
  --kubelet-client-key='/var/lib/kubernetes/kubernetes-key.pem' \\
  --runtime-config='api/all=true' \\
  --service-account-key-file='/var/lib/kubernetes/service-account.pem' \\
  --service-cluster-ip-range='10.32.0.0/24' \\
  --service-node-port-range='30000-32767' \\
  --tls-cert-file='/var/lib/kubernetes/kubernetes.pem' \\
  --tls-private-key-file='/var/lib/kubernetes/kubernetes-key.pem' \\
  --service-account-signing-key-file='/var/lib/kubernetes/service-account-key.pem' \\
  --service-account-issuer='https://kubernetes.default.svc.cluster.local' \\
  --api-audiences='https://kubernetes.default.svc.cluster.local' \\
  --v='2'
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF
```

```bash
{
  sudo systemctl daemon-reload
  sudo systemctl enable kube-apiserver
  sudo systemctl start kube-apiserver
}
```

```bash
wget -q --show-progress --https-only --timestamping \
  https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubectl \
  && chmod +x kubectl \
  && sudo mv kubectl /usr/local/bin/
```

```
{
  kubectl config set-cluster kubernetes-the-hard-way \
    --certificate-authority=ca.pem \
    --embed-certs=true \
    --server=https://127.0.0.1:6443 \
    --kubeconfig=admin.kubeconfig

  kubectl config set-credentials admin \
    --client-certificate=admin.pem \
    --client-key=admin-key.pem \
    --embed-certs=true \
    --kubeconfig=admin.kubeconfig

  kubectl config set-context default \
    --cluster=kubernetes-the-hard-way \
    --user=admin \
    --kubeconfig=admin.kubeconfig

  kubectl config use-context default --kubeconfig=admin.kubeconfig
}
```

```bash
kubectl version --kubeconfig=admin.kubeconfig
```

```bash
{
cat <<EOF> pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: hello-world
spec:
  serviceAccountName: hello-world
  containers:
    - name: hello-world-container
      image: busybox
      command: ['sh', '-c', 'while true; do echo "Hello, World!"; sleep 1; done']
  nodeName: worker
EOF

cat <<EOF> sa.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: hello-world
automountServiceAccountToken: false
EOF

kubectl apply -f sa.yaml --kubeconfig=admin.kubeconfig
kubectl apply -f pod.yaml --kubeconfig=admin.kubeconfig
}
```

kubelet

????, ага ще напевно потрібно виписувати сертифікати на публічний айпішнік
```bash
sudo echo "127.0.0.1 worker" >> /etc/hosts
```

```bash
{
cat > kubelet-csr.json <<EOF
{
  "CN": "system:node:worker",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "system:nodes",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -hostname=127.0.0.1 \
  -profile=kubernetes \
  kubelet-csr.json | cfssljson -bare kubelet
}
```

```bash
{
  sudo apt-get update
  sudo apt-get -y install socat conntrack ipset
}
```

```bash
sudo swapon --show
```

```bash
sudo swapoff -a
```


```bash
wget -q --show-progress --https-only --timestamping \
  https://github.com/opencontainers/runc/releases/download/v1.0.0-rc93/runc.amd64 \
  https://github.com/containernetworking/plugins/releases/download/v0.9.1/cni-plugins-linux-amd64-v0.9.1.tgz \
  https://github.com/containerd/containerd/releases/download/v1.4.4/containerd-1.4.4-linux-amd64.tar.gz \
  https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kube-proxy \
  https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubelet
```


```bash
sudo mkdir -p \
  /etc/cni/net.d \
  /opt/cni/bin \
  /var/lib/kubelet \
  /var/lib/kube-proxy \
  /var/lib/kubernetes \
  /var/run/kubernetes
```

```bash
{
  mkdir containerd
  tar -xvf containerd-1.4.4-linux-amd64.tar.gz -C containerd
  sudo tar -xvf cni-plugins-linux-amd64-v0.9.1.tgz -C /opt/cni/bin/
  sudo mv runc.amd64 runc
  chmod +x kube-proxy kubelet runc 
  sudo mv kube-proxy kubelet runc /usr/local/bin/
  sudo mv containerd/bin/* /bin/
}
```

```bash
cat <<EOF | sudo tee /etc/cni/net.d/10-bridge.conf
{
    "cniVersion": "0.4.0",
    "name": "bridge",
    "type": "bridge",
    "bridge": "cnio0",
    "isGateway": true,
    "ipMasq": true,
    "ipam": {
        "type": "host-local",
        "ranges": [
          [{"subnet": "10.240.1.0/24"}]
        ],
        "routes": [{"dst": "0.0.0.0/0"}]
    }
}
EOF
```

```bash
cat <<EOF | sudo tee /etc/cni/net.d/99-loopback.conf
{
    "cniVersion": "0.4.0",
    "name": "lo",
    "type": "loopback"
}
EOF
```

```bash
sudo mkdir -p /etc/containerd/
```

```bash
cat << EOF | sudo tee /etc/containerd/config.toml
[plugins]
  [plugins.cri.containerd]
    snapshotter = "overlayfs"
    [plugins.cri.containerd.default_runtime]
      runtime_type = "io.containerd.runtime.v1.linux"
      runtime_engine = "/usr/local/bin/runc"
      runtime_root = ""
EOF
```

```bash
cat <<EOF | sudo tee /etc/systemd/system/containerd.service
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target

[Service]
ExecStartPre=/sbin/modprobe overlay
ExecStart=/bin/containerd
Restart=always
RestartSec=5
Delegate=yes
KillMode=process
OOMScoreAdjust=-999
LimitNOFILE=1048576
LimitNPROC=infinity
LimitCORE=infinity

[Install]
WantedBy=multi-user.target
EOF
```

```bash
{
kubectl config set-cluster kubernetes-the-hard-way \
    --certificate-authority=ca.pem \
    --embed-certs=true \
    --server=https://127.0.0.1:6443 \
    --kubeconfig=kubelet.kubeconfig

kubectl config set-credentials system:node:worker \
    --client-certificate=kubelet.pem \
    --client-key=kubelet-key.pem \
    --embed-certs=true \
    --kubeconfig=kubelet.kubeconfig

kubectl config set-context default \
    --cluster=kubernetes-the-hard-way \
    --user=system:node:worker \
    --kubeconfig=kubelet.kubeconfig

kubectl config use-context default --kubeconfig=kubelet.kubeconfig
}
```

```bash
{
  sudo cp kubelet-key.pem kubelet.pem /var/lib/kubelet/
  sudo cp kubelet.kubeconfig /var/lib/kubelet/kubeconfig
  sudo cp ca.pem /var/lib/kubernetes/
}
```

```bash
cat <<EOF | sudo tee /var/lib/kubelet/kubelet-config.yaml
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  anonymous:
    enabled: false
  webhook:
    enabled: true
  x509:
    clientCAFile: "/var/lib/kubernetes/ca.pem"
authorization:
  mode: Webhook
clusterDomain: "cluster.local"
clusterDNS:
  - "10.32.0.10"
podCIDR: "10.240.1.0/24"
resolvConf: "/run/systemd/resolve/resolv.conf"
runtimeRequestTimeout: "15m"
tlsCertFile: "/var/lib/kubelet/kubelet.pem"
tlsPrivateKeyFile: "/var/lib/kubelet/kubelet-key.pem"
EOF
```

```bash
cat <<EOF | sudo tee /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
ExecStart=/usr/local/bin/kubelet \\
  --config=/var/lib/kubelet/kubelet-config.yaml \\
  --container-runtime=remote \\
  --container-runtime-endpoint=unix:///var/run/containerd/containerd.sock \\
  --image-pull-progress-deadline=2m \\
  --kubeconfig=/var/lib/kubelet/kubeconfig \\
  --network-plugin=cni \\
  --register-node=true \\
  --hostname-override=worker \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF
```


```bash
{
  sudo systemctl daemon-reload
  sudo systemctl enable kubelet
  sudo systemctl start kubelet
}
```

```bash
kubectl get nodes --kubeconfig=admin.kubeconfig
```

```bash
kubectl get pod --kubeconfig=admin.kubeconfig
```

```bash
cat <<EOF> nginx-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  serviceAccountName: hello-world
  containers:
  - name: nginx-container
    image: nginx
    ports:
    - containerPort: 80
  nodeName: worker
EOF


kubectl apply -f nginx-pod.yaml --kubeconfig=admin.kubeconfig
```

```bash
kubectl get pod nginx-pod --kubeconfig=admin.kubeconfig -o=jsonpath='{.status.podIP}'
```

```bash
curl $(kubectl get pod nginx-pod --kubeconfig=admin.kubeconfig -o=jsonpath='{.status.podIP}')
```

```bash
kubectl delete -f nginx-pod.yaml --kubeconfig=admin.kubeconfig
kubectl delete -f pod.yaml --kubeconfig=admin.kubeconfig
kubectl delete -f sa.yaml --kubeconfig=admin.kubeconfig
```

```bash
cat <<EOF> nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx-container
        image: nginx
        ports:
        - containerPort: 80
EOF

kubectl apply -f nginx-deployment.yaml --kubeconfig=admin.kubeconfig
```

```bash
kubectl get pod --kubeconfig=admin.kubeconfig
```

```bash
kubectl get deployment --kubeconfig=admin.kubeconfig
```
такс деплоймент є а подів немає - неподобство

# controller manager

```bash
{
cat > kube-controller-manager-csr.json <<EOF
{
  "CN": "system:kube-controller-manager",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "system:kube-controller-manager",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager

}
```

```bash
{
  kubectl config set-cluster kubernetes-the-hard-way \
    --certificate-authority=ca.pem \
    --embed-certs=true \
    --server=https://127.0.0.1:6443 \
    --kubeconfig=kube-controller-manager.kubeconfig

  kubectl config set-credentials system:kube-controller-manager \
    --client-certificate=kube-controller-manager.pem \
    --client-key=kube-controller-manager-key.pem \
    --embed-certs=true \
    --kubeconfig=kube-controller-manager.kubeconfig

  kubectl config set-context default \
    --cluster=kubernetes-the-hard-way \
    --user=system:kube-controller-manager \
    --kubeconfig=kube-controller-manager.kubeconfig

  kubectl config use-context default --kubeconfig=kube-controller-manager.kubeconfig
}
```

```bash
wget -q --show-progress --https-only --timestamping \
  "https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kube-controller-manager"
```

```bash
{
  chmod +x kube-controller-manager
  sudo mv kube-controller-manager /usr/local/bin/
}
```

```bash
sudo mv kube-controller-manager.kubeconfig /var/lib/kubernetes/
sudo cp ca-key.pem /var/lib/kubernetes/
```

```bash
cat <<EOF | sudo tee /etc/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \\
  --bind-address=0.0.0.0 \\
  --cluster-cidr=10.200.0.0/16 \\
  --cluster-name=kubernetes \\
  --cluster-signing-cert-file=/var/lib/kubernetes/ca.pem \\
  --cluster-signing-key-file=/var/lib/kubernetes/ca-key.pem \\
  --kubeconfig=/var/lib/kubernetes/kube-controller-manager.kubeconfig \\
  --leader-elect=true \\
  --root-ca-file=/var/lib/kubernetes/ca.pem \\
  --service-account-private-key-file=/var/lib/kubernetes/service-account-key.pem \\
  --service-cluster-ip-range=10.32.0.0/24 \\
  --use-service-account-credentials=true \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF
```

```bash
{
  sudo systemctl daemon-reload
  sudo systemctl enable kube-controller-manager
  sudo systemctl start kube-controller-manager
}
```


```bash
kubectl get pod --kubeconfig=admin.kubeconfig
```
такс, бачимо що наші поди створились
але вони незапускаються ніяк


# kube scheduler

```bash
{

cat > kube-scheduler-csr.json <<EOF
{
  "CN": "system:kube-scheduler",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "system:kube-scheduler",
      "OU": "Kubernetes The Hard Way",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  kube-scheduler-csr.json | cfssljson -bare kube-scheduler

}
```

```bash
{
  kubectl config set-cluster kubernetes-the-hard-way \
    --certificate-authority=ca.pem \
    --embed-certs=true \
    --server=https://127.0.0.1:6443 \
    --kubeconfig=kube-scheduler.kubeconfig

  kubectl config set-credentials system:kube-scheduler \
    --client-certificate=kube-scheduler.pem \
    --client-key=kube-scheduler-key.pem \
    --embed-certs=true \
    --kubeconfig=kube-scheduler.kubeconfig

  kubectl config set-context default \
    --cluster=kubernetes-the-hard-way \
    --user=system:kube-scheduler \
    --kubeconfig=kube-scheduler.kubeconfig

  kubectl config use-context default --kubeconfig=kube-scheduler.kubeconfig
}
```

```bash
wget -q --show-progress --https-only --timestamping \
  "https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kube-scheduler"
```

```bash
{
  chmod +x kube-scheduler
  sudo mv kube-scheduler /usr/local/bin/
}
```


```bash
sudo mv kube-scheduler.kubeconfig /var/lib/kubernetes/
```

```bash
cat <<EOF | sudo tee /etc/kubernetes/config/kube-scheduler.yaml
apiVersion: kubescheduler.config.k8s.io/v1beta1
kind: KubeSchedulerConfiguration
clientConnection:
  kubeconfig: "/var/lib/kubernetes/kube-scheduler.kubeconfig"
leaderElection:
  leaderElect: true
EOF
```

```bash
cat <<EOF | sudo tee /etc/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-scheduler \\
  --config=/etc/kubernetes/config/kube-scheduler.yaml \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF
```

```bash
{
  sudo systemctl daemon-reload
  sudo systemctl enable kube-scheduler
  sudo systemctl start kube-scheduler
}
```


```bash
kubectl get pod --kubeconfig=admin.kubeconfig
```
нарешті ми бачимо наші поди, вони запущені і ми навіть можемо перевірити чи вони працюють


```bash
curl $(kubectl get pods -l app=nginx --kubeconfig=admin.kubeconfig -o=jsonpath='{.items[0].status.podIP}')
```
чотко, бачимо що запустилось і працює