etcd

CentOS Linux release 7.2.1511 (Core)3.10.0-327.el7.x86_64

k8syum yum

etcd.service/usr/lib/systemd/system/

notify WorkingDirectory=/var/lib/etcd/

etcd set GOMAXPROCS to number of processors ExecStart=/bin/bash -c

GOMAXPROCS=$(nproc) /usr/bin/etcd \ –name=\

$ETCD_DATA_DIR\ \ –listen-peer-urls=\

$ETCD_LISTEN_PEER_URLS\ \ –advertise-client-urls=\

$ETCD_ADVERTISE_CLIENT_URLS\ \ –initial-cluster-token=\

$ETCD_INITIAL_CLUSTER_TOKEN\ \ –initial-cluster=\

$ETCD_INITIAL_CLUSTER\ \ –initial-cluster-state=\

$ETCD_INITIAL_CLUSTER_STATE\ \ –listen-client-urls=\

[Install] WantedBy=multi-user.target

Error: client: etcd cluster is unavailable or misconfigured

error 0: dial tcp 127.0.0.1:2379: getsockopt: connection refused

error 1: dial tcp 127.0.0.1:4001: getsockopt: connection refused

ETCD_LISTEN_CLIENT_URLS

docker.x86_64 1.10.3-46.el7.centos.14 @extras

docker-common.x86_64 1.10.3-46.el7.centos.14 @extras

docker-selinux.x86_64 1.10.3-46.el7.centos.14 @extras

cockpit-docker.x86_64 0.114-2.el7.centos extras

docker-devel.x86_64 1.3.2-4.el7.centos extras

docker-distribution.x86_64 2.4.1-2.el7 extras

docker-forward-journald.x86_64 1.10.3-44.el7.centos extras

docker-latest.x86_64 1.12.1-2.el7.centos extras

docker-latest-logrotate.x86_64 1.12.1-2.el7.centos extras

docker-latest-v1.10-migrator.x86_64 1.12.1-2.el7.centos extras

docker-logrotate.x86_64 1.10.3-46.el7.centos.14 extras

docker-lvm-plugin.x86_64 1.10.3-46.el7.centos.14 extras

docker-novolume-plugin.x86_64 1.10.3-46.el7.centos.14 extras

docker-python.x86_64 1.4.0-115.el7 extras

docker-registry.noarch 0.6.8-8.el7 extras

docker-registry.x86_64 0.9.1-7.el7 extras

.x86_64 1.10.3-46.el7.centos.14 extras

docker-v1.10-migrator.x86_64 1.10.3-46.el7.centos.14 extras

python-docker-py.noarch 1.7.2-1.el7 extras

amd64 Cannot connect to the Docker daemon. Is the docker daemon running on this host?

flannelyumsystemctlservice flannelservice

flanneld.service [Unit] Description=

Flanneld overlay address etcd agent After=

notify EnvironmentFile=/etc/sysconfig/

flanneld EnvironmentFile=-/etc/sysconfig/docker-

network ExecStart=/usr/bin/flanneld -etcd-endpoints=$FLANNEL_ETCD -etcd-prefix=

$FLANNEL_ETCD_KEY $FLANNEL_OPTIONS ExecStartPost=/usr/libexec/flannel/mk-docker-opts.

sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/

user.target RequiredBy=docker.service

/etc/sysconfig/flanneld

Flanneld configuration options etcd url location. Point this to the server where etcd runs FLANNEL_ETCD=

etcd config key. This is the configuration key that flannel queries For address range assignment FLANNEL_ETCD_KEY=

Any additional options that you want to pass FLANNEL_OPTIONS=

FLANNEL_OPTIONSflannel

Flanneld configuration options etcd url location. Point this to the server where etcd runs FLANNEL_ETCD=

etcd config key. This is the configuration key that flannel queries For address range assignment FLANNEL_ETCD_KEY=

Any additional options that you want to pass FLANNEL_OPTIONS=

service flanneld start systemctl start flannelflannel

dockerflannelddockerservice

Docker Application Container Engine Documentation=http:

plugin.socket Wants=docker-storage-

all import flannel configuration EnvironmentFile=-/etc/sysconfig/

flanneld EnvironmentFile=-/run/flannel/subnet.

docker EnvironmentFile=-/etc/sysconfig/docker-

storage EnvironmentFile=-/etc/sysconfig/docker-

current daemon \ –exec-opt native.cgroupdriver=

systemd \ $OPTIONS \ $DOCKER_STORAGE_OPTIONS \ $DOCKER_NETWORK_OPTIONS \ $ADD_REGISTRY \ $BLOCK_REGISTRY \ $INSECURE_REGISTRY \ –bip=

abnormal [Install] WantedBy=multi-user.target

EnvironmentFile=-/etc/sysconfig/flanneld

EnvironmentFile=-/run/flannel/subnet.env

1Failed to retrieve network config: 104: Not a directory (/flannel/network/config)

flanneletcd-prefix-key/flannel/network/config/flannel/network

1: lo: LOOPBACK,UP,LOWER_UP mtu

qdisc noqueue state UNKNOWN link/loopback

scope host lo valid_lft forever preferred_lft forever inet6 ::

scope host valid_lft forever preferred_lft forever

2: eno16777736: BROADCAST,MULTICAST,UP,LOWER_UP mtu

1500 qdisc pfifo_fast state UP qlen

scope global dynamic eno16777736 valid_lft 1554sec preferred_lft 1554sec inet6 fe80::20c:29ff:fe79:cfe3/

scope link valid_lft forever preferred_lft forever

9: flannel0: POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP mtu

1472 qdisc pfifo_fast state UNKNOWN qlen

scope global flannel0 valid_lft forever preferred_lft forever

10: docker0: NO-CARRIER,BROADCAST,MULTICAST,UP mtu

qdisc noqueue state DOWN link/ether

scope global docker0 valid_lft forever preferred_lft forever

3

systemdetcdFailed at step CHDIR spawning /usr/bin/

etcd: No such file or directory etcd.serviceWorkingDirectory

systemdetcdcannot assign requested address IP

systemdetcd error listing data dir:

0.0.0.0:2379 –advertise-client-urls

,systemdetcd,default.etcd chown etcd:etcd

etcd cant start due to status

k8setcdrequest sent was ignored (cluster ID mismatch peer[c39bdec535db1fd5]=cdf818194e3a8c

2 Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Either boot into a newer kernel or disable selinux

1request sent was ignored (cluster ID mismatch: peer[c39bdec535db1fd5]cdf818194e3a8c32, localb0daaba520989844)

2Error: client: etcd cluster is unavailable or misconfigured; error 0: dial tcp 127.0.0.1:4001: connect: connection refused

; error 1: client: endpoint exceeded header timeout

systemctl status etcd.service

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

Jun 18 01:09:29 localhost.localdomain etcd

: c3342da4612d81d7 is starting a new election at term 133 Jun 18 01:09:29 localhost.localdomain etcd

: c3342da4612d81d7 became candidate at term 134 Jun 18 01:09:29 localhost.localdomain etcd

: c3342da4612d81d7 received MsgVoteResp from c3342da4612d81d7 at term 134 Jun 18 01:09:29 localhost.localdomain etcd

sent MsgVote request to c39bdec535db1fd5 at term 134

cluster may be unhealthy: failed to list members Error: client: etcd cluster is unavailable or misconfigured

0: client: endpoint exceeded header timeout

1: dial tcp 127.0.0.1:4001: connect: connection refused

0: client: endpoint exceeded header timeout

1: dial tcp 127.0.0.1:4001: connect: connection refused

cluster may be unhealthy: failed to list members Error: client: etcd cluster is unavailable or misconfigured

0: dial tcp 127.0.0.1:4001: connect: connection refused

1: client: endpoint exceeded header timeout

0: dial tcp 127.0.0.1:4001: connect: connection refused

1: client: endpoint exceeded header timeout

1:rafthttp: request sent was ignored (cluster ID mismatch: peer[b6568aca930d28d4]cdf818194e3a8c32, local9c8b920197d88342)

2peeretcd

**masternode/var/lib/etcd/etcd**

fopenfwritefreadfgetcfputcfscanffprintfftellfseek

fopen include FILE * fopen(const char * path,const char * mode); path

ctl \ –ca-file=ca.pem –cer…

.service failed because a timeout was exceeded. See systemctl status

.service and journalctl -xe for details.

healthcheckkubectl applypoddeploymentpendingdescriberancher

ctl ** –ca-file=ca.pem –cert-file…

velocity http400HTTP Status 400 The

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-raftReady

k8setcdrequest sent was ignored (cluster ID mismatch: peer[c39bdec535db1fd5]=cdf818194e3a8c

Dockerfile+docker RegistryDocker HarborV2.0.0

Beginner_G:Ansible copy 3backup

:vmware workstation

Setup Etcd Cluster on CentOS 78 Ubuntu 18041604 Debian 109

A password will be e-mailed to you.

Setup Etcd Cluster on CentOS 7/8 / Ubuntu 18.04/16.04 / Debian 10/9

Setup Etcd Cluster on CentOS 7/8 / Ubuntu 18.04/16.04 / Debian 10/9

Welcome to our guide on how to setup etcd Cluster on CentOS 7/8 / Ubuntu 18.04/16.04 / Debian 10/9 / Fedora 30/29 Linux machines. This tutorial will go into detail in discussing the ideal setup of athree-nodeetcd cluster on a Linux box This can be Etcd cluster on Ubuntu / Debian / CentOS / Fedora / Arch / Linux Mint or other modern Linux distribution.

etcd is a distributed and reliable key-value store for the most critical data of a distributed system. It is written in Go and uses theRaftconsensus algorithm to manage a highly-available replicated log.

: well-defined, user-facing API (gRPC)

: automatic TLS with optional client cert authentication

Etcd Cluster Setup on Linux CentOS / Ubuntu / Debian / Fedora

This setup should work on all Linux distributions which uses systemd service manager.

This setup is based on below server network information and details.Short HostnameIP Addressetcd1192.168.18.9etcd2192.168.18.10etcd3192.168.18.11

Since all my servers uses Systemd service manager, the hostnames can be set using the commands. Node 1 sudo hostnamectl set-hostname –static sudo hostname m Node 2 sudo hostnamectl set-hostname etcd2.mydomain.com –static sudo hostname etcd2.mydomain.com Node 3 sudo hostnamectl set-hostname etcd3.mydomain.com –static sudo hostname etcd3.mydomain.com

Replacemydomain.comwith your servers domain name. The server names can be mapped to correct IP addresses on your Local DNS or by directly adding records to/etc/hostsfile on each server.sudo tee -a /etc/hostsEOF 192.168.18.9 etcd1.mydomain.com etcd1 192.168.18.10 etcd2.mydomain.com etcd2 192.168.18.11 etcd3.mydomain.com etcd3 EOFStep 1: Download and Install the etcd Binaries (All nodes)

Login to each etcd cluster node to be used and download etcd binaries. This is done onall nodes.

Create temporary directory.mkdir /tmp/etcd && cd /tmp/etcd

Install wget. RHEL familysudo yum -y install wget Debian familysudo apt-get -y install wget Arch/Manjarosudo pacman -S wget

Download etcd binary archive.curl -s \ grep browser_download_url \ grep linux-amd64 \ cut -d -f 4 \ wget -qi –

Unarchive the file and move binaries to/usr/local/bindirectory.tar xvf *.tar.gz cd etcd-*/ sudo mv etcd* /usr/local/bin/ cd ~ rm -rf /tmp/etcd

Checketcdandetcdctlversion.$etcd –versionetcd Version: 3.3.13 Git SHA: 98d3084 Go Version: go1.10.8 Go OS/Arch: linux/amd64 $etcdctl –versionetcdctl version: 3.3.13 API version: 2Step 2: Create etcd directories and user (All nodes)

We will store etcd configuration files inside the/etc/etcddirectory and data in/var/lib/etcd. The user and group used to manage service is called etcd.

Create aetcdsystem user/group.sudo groupadd –system etcd sudo useradd -s /sbin/nologin –system -g etcd etcd

Then create data and configurations directories for etcd.sudo mkdir -p /var/lib/etcd/ sudo mkdir /etc/etcd sudo chown -R etcd:etcd /var/lib/etcd/Step 3: Configure the etcd on all nodes

We need to populate systemd service unit files on all the three servers. But first, some environment variables are required before we can proceed.

On each server, save these variables by running the commands below.INT_NAME=eth0 ETCD_HOST_IP=$(ip addr show $INT_NAME grep inet\b awk print $2 cut -d/ -f1) ETCD_NAME=$(hostname -s)

Where:INT_NAMEis the name of your network interface to be used for cluster traffic. Change it to match your server configuration.ETCD_HOST_IPis the internal IP address of the specified network interface. This is used to serve client requests and communicate with etcd cluster peers.ETCD_NAME Each etcd member must have a unique name within an etcd cluster. Command used will set the etcd name to match the hostname of the current compute instance.

Once all variables are set, create theetcd.servicesystemd unit file:cat EOF sudo tee /etc/systemd/system/etcd.service [Unit] Description=etcd service Documentation= [Service] Type=notify User=etcd ExecStart=/usr/local/bin/etcd \\ –name $ETCD_NAME \\ –data-dir=/var/lib/etcd \\ –initial-advertise-peer-urls \\ –listen-peer-urls \\ –listen-client-urls \\ –advertise-client-urls \\ –initial-cluster-token etcd-cluster-0 \\ –initial-cluster etcd1= \\ –initial-cluster-state new \ [Install] WantedBy=multi-user.target EOF

If you dont have working name resolution or mappings added to/etc/hostsfile, then replaceetcd1,etcd2andetcd3with your nodes IP addresses.

For CentOS / RHEL Linux distributions, set SELinux mode to permissive.sudo setenforce 0 sudo sed -i s/^SELINUX=.*/SELINUX=permissive/g /etc/selinux/config

If you have active firewall service, allow ports2379and2380. RHEL / CentOS / Fedora firewalldsudo firewall-cmd –add-port=2379,2380/tcp –permanent sudo firewall-cmd –reload Ubuntu/Debiansudo ufw allow proto tcp from any to any port 2379,2380Step 4: Start the etcd Server

Start etcd service by running the following commands on each cluster node.sudo systemctl daemon-reload sudo systemctl enable etcd sudo systemctl start etcd

Confirm thatetcdservice is running on all nodes.[[emailprotected]~]$ systemctl status etcd -l etcd.service – etcd service Loaded: loaded (/etc/systemd/system/etcd.service; disabled; vendor preset: disabled) Active: active (running) since Mon 2019-06-03 18:20:49 UTC; 30s ago Docs: Main PID: 5931 (etcd) CGroup: /system.slice/etcd.service 5931 /usr/local/bin/etcd –name etcd1 –data-dir=/var/lib/etcd –initial-advertise-peer-urls –listen-peer-urls –listen-client-urls –advertise-client-urls –initial-cluster-token etcd-cluster-0 –initial-cluster etcd1= –initial-cluster-state new ………………………………………………………………………… [[emailprotected]~]$ systemctl status etcd -l etcd.service – etcd service Loaded: loaded (/etc/systemd/system/etcd.service; enabled; vendor preset: disabled) Active: active (running) since Mon 2019-06-03 18:20:49 UTC; 2min 17s ago Docs: Main PID: 5949 (etcd) CGroup: /system.slice/etcd.service 5949 /usr/local/bin/etcd –name etcd2 –data-dir=/var/lib/etcd –initial-advertise-peer-urls –listen-peer-urls –listen-client-urls –advertise-client-urls –initial-cluster-token etcd-cluster-0 –initial-cluster etcd1= –initial-cluster-state new ………………………………………………………………………… [[emailprotected]~]$ systemctl status etcd -l etcd.service – etcd service Loaded: loaded (/etc/systemd/system/etcd.service; enabled; vendor preset: disabled) Active: active (running) since Mon 2019-06-03 18:20:49 UTC; 3min 20s ago Docs: Main PID: 5974 (etcd) CGroup: /system.slice/etcd.service 5974 /usr/local/bin/etcd –name etcd3 –data-dir=/var/lib/etcd –initial-advertise-peer-urls –listen-peer-urls –listen-client-urls –advertise-client-urls –initial-cluster-token etcd-cluster-0 –initial-cluster etcd1= –initial-cluster-state newStep 5: Test Etcd Cluster installation

Test your setup by listing the etcd cluster members:$etcdctl member list152d6f8123c6ac97: name=etcd3 peerURLs= clientURLs= isLeader=false 332a8a315e569778: name=etcd2 peerURLs= clientURLs= isLeader=false aebb404b9385ccd4: name=etcd1 peerURLs= clientURLs= isLeader=true

To use etcdv3, you need to explicitly specify version.$ETCDCTL_API=3 etcdctl member list152d6f8123c6ac97, started, etcd3, 332a8a315e569778, started, etcd2, aebb404b9385ccd4, started, etcd1,

Also check cluster health by running the command:$etcdctl cluster-healthmember 152d6f8123c6ac97 is healthy: got healthy result from member 332a8a315e569778 is healthy: got healthy result from member aebb404b9385ccd4 is healthy: got healthy result from cluster is healthy

Lets also try writing to etcd.$etcdctl set /message Hello World

Read the value ofmessageback It should work on all nodes.$etcdctl get /message

Create directory.$etcdctl mkdir /myservice

$etcdctl set /myservice/container1 localhost:8080

/myservice/container1Step 6 Test Leader failure

When a leader fails, the etcd cluster automatically elects a new leader. The election does not happen instantly once the leader fails. It takes about an election timeout to elect a new leader since the failure detection model is timeout based.

During the leader election, the cluster cannot process any writes. Write requests sent during the election are queued for processing until a new leader is elected.

Our current leader isetcd1 Node 1.$etcdctl member list152d6f8123c6ac97: name=etcd3 peerURLs= clientURLs= isLeader=false 332a8a315e569778: name=etcd2 peerURLs= clientURLs= isLeader=false aebb404b9385ccd4: name=etcd1 peerURLs= clientURLs=isLeader=true

Lets take it down.[[emailprotected]~]$ sudo systemctl stop etcd

Check new Leader Nowetcd2server.$etcdctl member list152d6f8123c6ac97: name=etcd3 peerURLs= clientURLs= isLeader=false 332a8a315e569778: name=etcd2 peerURLs= clientURLs=isLeader=trueaebb404b9385ccd4: name=etcd1 peerURLs= clientURLs= isLeader=false

Onceetcd1service is started, the leader will remainetcd2unless it goes down.Conclusion

You now a working three node Etcd cluster installed on CentOS 7/8, Ubuntu 18.04, Debian 10/9. VisitEtcd documentationfor detailed setup and usage guide.

Setup Consul Cluster on Ubuntu/Debian

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Thank You for your support as we work to give you the best of guides and articles. Click below to buy us a coffee.TAGSetcdkey value storePrevious articleInstall and Use Linux Malware Detect on CentOS / Fedora / Ubuntu / DebianNext articleHow To Monitor Etcd Cluster with Prometheus and GrafanaJosphat MutaiFounder of Computingforgeeks. Expertise in Virtualization, Cloud, Linux/UNIX Administration, Automation,Storage Systems, Containers, Server Clustering e.t.c.BackupBackup Etcd data on OpenShift 4.x to AWS S3 BucketMonitoringHow To Monitor Etcd Cluster with Prometheus and GrafanaDevHow to Install etcd on RHEL 8 / CentOS 8DatabasesHow to Install etcd on Ubuntu 18.04 / Ubuntu 16.041 COMMENTKaiMay 23, 2021 At 2:04 pm

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ETCD client etcd cluster is unavailable or misconfigured; error 0 x509 certificate is valid fo

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etcdetcd cluster is unavailable or misconfigured

[] ./etcdctl member list client: etcd cluster is unavailable or misconfigured [] ./etcdctl member list 56812ae88262debe: name=node0 peerURLs= clientURLs= isLeader=true 65818045dfc0be0f: name=node1 peerURLs= clientURLs= isLeader=false c04df6bf225b1040: name=node2 peerURLs= clientURLs= isLeader=false [] ./etcdctl member list client: etcd cluster is unavailable or misconfigured

etcdctl member list etcd cluster is unavailable or misconfiguredetcd

[] ./etcdctl –debug member list start to sync cluster using endpoints( cURL Command: curl -X GET got endpoints() after sync Cluster-Endpoints: cURL Command: curl -X GET /v2/members client: etcd cluster is unavailable or misconfigured

[] ./etcdctl –debug –endpoints ls start to sync cluster using endpoints( cURL Command: curl -X GET got endpoints( after sync Cluster-Endpoints: cURL Command: curl -X GET