Etcd是coreos开发的一个kv的软件，我使用他做存储数据，比如持久化固定ip，就是把固定的docker容器ip信息存放到etcd里，智能配置docker防火墙的信息也是存放到etcd里，这个软件很小型，并且支持集群，很是方便，现在给大家介绍一下如何在centos6系统里安装此软件。
先简单介绍一下etcd，从网上复制的
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etcd是一个高可用的键值存储系统，主要用于共享配置和服务发现。
etcd的特性如下：
简单: curl可访问的用户的API（HTTP+JSON）
安全: 可选的SSL客户端证书认证
快速: 单实例每秒 1000 次写操作
可靠: 使用Raft保证一致性
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安装环境
系统：centos6.6
etcd版本0.4.6
虽然有最新的版本，但我一直使用这个版本，比较稳定
下面是安装过程
1、下载
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curl -L https:
//github
.com
/coreos/etcd/releases/download/v0
.4.6
/etcd-v0
.4.6-linux-amd64.
tar
.gz -o etcd-v0.4.6-linux-amd64.
tar
.gz
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2、解压
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tar
xzvf etcd-v0.4.6-linux-amd64.
tar
.gz
cd
etcd-v0.4.6-linux-amd64
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3、复制程序到系统环境
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cp
etcd
/usr/local/bin
cp
etcdctl
/usr/local/bin
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4、设置运行脚本，绝对路径是/etc/init.d/etcd
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#!/bin/bash
# Copyright 2013, Nathan Milford
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# /etc/init.d/etcd
#
# Startup script for etcd
#
# chkconfig: 2345 20 80
# description: Starts and stops etcd
.
/etc/init
.d
/functions
prog=
"etcd"
prog_bin=
"/usr/local/bin/$prog"
desc=
"etcd shared configuration and service discovery daemon"
if
! [ -f $prog_bin ];
then
echo
"$prog binary not found."
exit
5
fi
if
[ -f
/etc/sysconfig/
$prog ];
then
.
/etc/sysconfig/
$prog
else
echo
"No sysconfig file found in /etc/sysconfig/$prog... exiting."
exit
5
fi
start() {
echo
"Starting $desc ($prog): "
su
$ETCD_USER -c
"nohup $prog_bin $ETCD_OPTS >>$ETCD_OUT_FILE 2>&1 &"
RETVAL=$?
return
$RETVAL
}
stop() {
echo
"Shutting down $desc ($prog): "
pkill -f $prog_bin
}
restart() {
stop
start
}
status() {
if
[ -z $pid ];
then
pid=$(pgrep -f $prog_bin)
fi
if
[ -z $pid ];
then
echo
"$prog is NOT running."
return
1
else
echo
"$prog is running (pid is $pid)."
fi
}
case
"$1"
in
start) start;;
stop) stop;;
restart) restart;;
status) status;;
*)
echo
"Usage: $0 {start|stop|restart|status}"
RETVAL=2;;
esac
exit
$RETVAL
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5、设置etcd软件环境配置，根据自己的实际环境修改
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09:21:19
# cat /etc/sysconfig/etcd
#!/bin/bash
# Copyright 2014, Nathan Milford
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
lib_dir=
'/var/lib/etcd/'
# Will be used to populate IP address values below. Setting some items to
# '0.0.0.0' is not compatable with the discovery API.
#_MY_IPADDR=$(/sbin/ifconfig | grep 'inet'| grep -Ev '(127|117|172|::1|fe)' |awk '{print $2}'|head -n 1)
_MY_IPADDR=10.10.29.236
# Daemon User
#ETCD_USER="etcd"
# Cluster Seeds
# You can specify a list here sepearated by commas, or leave it blank if
# you're playing with a single node.
ETCD_SEEDS=
""
# Discovery Endpoint
# Leave it as the public URL unless you are running your own.
ETCD_DISCOVER_ENDPOINT=
"https://discovery.etcd.io/"
# Discovery Token
# If you are using the discovery protocol you can grab your cluster token
# from https://discovery.etcd.io/new if you are not hosting it yourself.
ETCD_DISCOVERY_TOKEN=
"cb5940a807d44287e05f29f3170883e3"
# This node's name as it represents itself on the cluster.
ETCD_NODE_NAME=$(
hostname
-s)
# Hostname and port for the etcd server to work on.
ETCD_LISTEN=
"$_MY_IPADDR:4001"
# Directory to store log and snapshot.
ETCD_DATA_DIR=
"/var/lib/etcd/"
# File to log stdout/stderr to.
ETCD_OUT_FILE=
"/var/log/etcd/etcd.log"
# Set logging vebosity for the file above.
# Valid options are "", "v" or "vv"
ETCD_LOGGING=
""
# Max size of the cluster.
ETCD_MAXSIZE=9
# Max size of result buffer.
ETCD_MAXRESULT=1024
# Number of retries to attempt while joining a cluster
ETCD_RETRIES=3
# Set security settings for the etcd server.
# Leave blank if you do not plan to use this feature, otherwise add appropriate
# paths.
ETCD_CAFILE=
""
ETCD_CERT=
""
ETCD_KEY=
""
# Toggles snapshotting.
# Keep blank or set to true.
ETCD_SNAPSHOT=
""
# Hostname and port for the RAFT server to work on.
RAFT_LISTEN=
"$_MY_IPADDR:7001"
# Set security settings for the RAFT server.
# Leave blank if you do not plan to use this feature, otherwise add appropriate
# paths.
RAFT_CAFILE=
""
RAFT_CERT=
""
RAFT_KEY=
""
# Below we build the opts to pass to the init script.
ETCD_OPTS="-name=${ETCD_NODE_NAME} \
-addr=${ETCD_LISTEN} \
-peer-addr=${RAFT_LISTEN} \
-data-
dir
=${ETCD_DATA_DIR} \
-max-result-buffer=${ETCD_MAXRESULT} \
-max-cluster-size=${ETCD_MAXSIZE} \
-max-retry-attempts=${ETCD_RETRIES}"
if
[ x$ETCD_SEEDS !=
"x"
];
then
ETCD_OPTS=
"$ETCD_OPTS -peers=${ETCD_SEEDS}"
fi
if
[ x$ETCD_DISCOVERY_TOKEN !=
"x"
];
then
ETCD_OPTS=
"$ETCD_OPTS -discovery=${ETCD_DISCOVER_ENDPOINT}${ETCD_DISCOVERY_TOKEN}"
fi
if
[
"$ETCD_LOGGING"
==
"v"
];
then
ETCD_OPTS=
"$ETCD_OPTS -v"
elif
[
"$ETCD_LOGGING"
==
"vv"
];
then
ETCD_OPTS=
"$ETCD_OPTS -vv"
fi
if
[ x$ETCD_SNAPSHOT !=
"x"
];
then
ETCD_OPTS=
"$ETCD_OPTS -snapshot"
fi
if
[ ! -d $lib_dir ];
then
mkdir
-p $lib_dir
fi
#if [ x$ETCD_CAFILE != "x" ] && [ x$ETCD_CERT != "x" ] && [ x$ETCD_KEY != "x" ]; then
# ETCD_OPTS="$ETCD_OPTS -ca-file=${ETCD_CAFILE} -cert-file=${ETCD_CERT} -key-file=${ETCD_KEY}"
#fi
#if [ x$RAFT_CAFILE != "x" ] && [ x$RAFT_CERT != "x" ] && [ x$RAFT_KEY != "x" ]; then
# ETCD_OPTS="$ETCD_OPTS -peer-ca-file=${RAFT_CAFILE} -peer-cert-file=${RAFT_CERT} -peer-key-file=${RAFT_KEY}"
#fi
#echo $ETCD_OPTS
# TODO
# Add support for:
# -peers-file
# -config
# -cors
# -cpuprofile
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如果不想加入集群，就把ETCD_DISCOVER_ENDPOINT与ETCD_DISCOVERY_TOKEN给注释了，另外_MY_IPADDR是本机的ip
6、创建用户
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useradd
etcd -M -s
/sbin/nologin
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7、创建日志与数据存放目录
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mkdir
/var/log/etcd
mkdir
/var/lib/etcd
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8、授予权限
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chown
-R etcd:etcd
/var/log/etcd
chown
-R etcd:etcd
/var/lib/etcd
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9、启动
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/etcd/init
.d
/etcd
start
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10、设置开机启动
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chkconfig --level 345 etcd on
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11、查看运行情况
查看集群主机ip
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12:22:48
# curl -L http://127.0.0.1:4001/v2/machines
http:
//10
.10.21.199:4001, http:
//10
.10.27.221:4001, http:
//10
.10.17.3:4001, http:
//10
.10.17.4:4001, http:
//10
.10.29.236:4001
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查看集群主机列表（详细）
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12:23:07
# curl -L http://127.0.0.1:4001/v2/keys/_etcd/machines
{
"action"
:
"get"
,
"node"
:{
"key"
:
"/_etcd/machines"
,
"dir"
:
true
,
"nodes"
:[{
"key"
:
"/_etcd/machines/docker-test1"
,
"value"
:
"etcd=http%3A%2F%2F10.10.21.199%3A4001\u0026raft=http%3A%2F%2F10.10.21.199%3A7001"
,
"modifiedIndex"
:1,
"createdIndex"
:1},{
"key"
:
"/_etcd/machines/docker-test2"
,
"value"
:
"etcd=http%3A%2F%2F10.10.27.221%3A4001\u0026raft=http%3A%2F%2F10.10.27.221%3A7001"
,
"modifiedIndex"
:9,
"createdIndex"
:9},{
"key"
:
"/_etcd/machines/docker-test3"
,
"value"
:
"etcd=http%3A%2F%2F10.10.17.3%3A4001\u0026raft=http%3A%2F%2F10.10.17.3%3A7001"
,
"modifiedIndex"
:16,
"createdIndex"
:16},{
"key"
:
"/_etcd/machines/ip-10-10-17-4"
,
"value"
:
"etcd=http%3A%2F%2F10.10.17.4%3A4001\u0026raft=http%3A%2F%2F10.10.17.4%3A7001"
,
"modifiedIndex"
:177304,
"createdIndex"
:177304},{
"key"
:
"/_etcd/machines/ip-10-10-29-236"
,
"value"
:
"etcd=http%3A%2F%2F10.10.29.236%3A4001\u0026raft=http%3A%2F%2F10.10.29.236%3A7001"
,
"modifiedIndex"
:2101510,
"createdIndex"
:2101510}],
"modifiedIndex"
:1,
"createdIndex"
:1}}
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查看集群header
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12:23:15
# curl -L http://127.0.0.1:4001/v2/leader
http:
//10
.10.17.4:7001
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详细请参考https://github.com/coreos/etcd
本文转自 dl528888 51CTO博客，原文链接：http://blog.51cto.com/dl528888/1623746，如需转载请自行联系原作者
