etcd安装和所遇到的坑
本文内容纲要:
- 1、ETCD安装- 1.1 检查ETCD版本
- 1.2 安装ETCD
- 1.3 修改ETCD配置
- 2、Docker安装
- 2.1、检查docker版本
- 2.2 安装docker
- 2.3 检查docker安装信息
- 3 flannel
- 3.1 检查flannel版本
- 3.2 安装flannel
- 3.3 修改service配置
- 3.4 启动FLANNEL
- 3.5 修改docker网络
- 3.6 问题
- 注意:如上配置需要在集群的所有机器上执行,完成后,上述安装的各个系统的启动顺序应该是:
- 配置完检查:
首先参照 https://www.cnblogs.com/lyzw/p/6016789.html来安装
虚拟机:VMware® Workstation 12 Pro
系统:CentOS Linux release 7.2.1511 (Core) 3.10.0-327.el7.x86_64
由于刚开始学习k8s,本次软件的安装,我们都采用最简单的方式,能用yum 安装的尽量采用yum安装
1、ETCD安装
ETCD官方文档:https://github.com/coreos/etcd/blob/master/Documentation/docs.md
1.1 检查ETCD版本
[root@localhost ~]# yum list|grep etcdetcd.x86_64 2.3.7-4.el7 @extras
[root@localhost ~]#
1.2 安装ETCD
yum install etcd
1.3 修改ETCD配置
安装好后,系统会自动生成etcd.service文件(路径为/usr/lib/systemd/system/),修改对应的配置
[Unit]Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify WorkingDirectory=/var/lib/etcd/ EnvironmentFile=-/etc/etcd/etcd.conf User=etcd # set GOMAXPROCS to number of processors ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd \ --name=\"${ETCD_NAME}\" \ --data-dir=\"${ETCD_DATA_DIR}\" \ --listen-peer-urls=\"${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=\"${ETCD_LISTEN_CLIENT_URLS}\"" Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target
并配置其配置文件
ETCD_NAME=zwetcd_2ETCD_DATA_DIR="/var/lib/etcd/default.etcd"ETCD_LISTEN_PEER_URLS="http://192.168.37.131:2380" ETCD_LISTEN_CLIENT_URLS="http://192.168.37.131:2379,http://127.0.0.1:2379" #[cluster] ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.37.131:2380" # if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..." ETCD_INITIAL_CLUSTER="zwetcd_2=http://192.168.37.131:2380,zwetcd_1=http://192.168.37.130:2380" ETCD_INITIAL_CLUSTER_STATE="new" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" ETCD_ADVERTISE_CLIENT_URLS="http://192.168.37.131:2379"
如果使用firewalld作为防火墙,则需要开放端口:
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** 问题:**
1、本地连接报错
[root@localhost system]# etcdctl ls /
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
如果出现如上的错误,是因为ETCD_LISTEN_CLIENT_URLS参数没有配置http://127.0.0.1:2379而导致的,不过已经配置了具体的IP,还需要配置本地链路,这个就有点奇怪了。
2、Docker安装
2.1、检查docker版本
yum list |grep docker
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2.2 安装docker
1 yum install docker -y
2.3 检查docker安装信息
[root@localhost ~]# docker versionClient:
Version: 1.10.3
API version: 1.22 Package version: docker-common-1.10.3-46.el7.centos.14.x86_64 Go version: go1.6.3 Git commit: cb079f6-unsupported Built: Fri Sep 16 13:24:25 2016 OS/Arch: linux/amd64 Cannot connect to the Docker daemon. Is the docker daemon running on this host?
3 flannel
3.1 检查flannel版本
[root@localhost etcd]# yum list |grep flannelflannel.x86_64 0.5.3-9.el7 @extras
3.2 安装flannel
yum install flannel
3.3 修改service配置
查看flannel的配置文件(使用yum安装会自动生成此文件,如果下载的执行文件则需要手动生成,在使用systemctl命令执行service 的时候会用到),可以看到flannel的service配置如下:
[root@localhost etcd]# more /usr/lib/systemd/system/flanneld.service[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
After=network-online.target
Wants=network-online.target After=etcd.service Before=docker.service [Service] Type=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/docker Restart=on-failure [Install] WantedBy=multi-user.target RequiredBy=docker.service
其中所有的参数都配置在/etc/sysconfig/flanneld文件中,修改此文件,初始文件如下:
# Flanneld configuration options # etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD="http://127.0.0.1:2379"
# etcd config key. This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_KEY="/atomic.io/network" # Any additional options that you want to pass FLANNEL_OPTIONS=""
其中
FLANNEL_ETCD:为ETCD的地址,
FLANNEL_ETCD_KEY:为在etcd中配置的网络参数的key
FLANNEL_OPTIONS:为flannel的启动参数,我在这里加上了监听的网卡
根据前面步骤中etcd的配置,我们修改配置文件如下:
# Flanneld configuration options # etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD="http://192.168.37.130:2379"
# etcd config key. This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_KEY="/flannel/network" # Any additional options that you want to pass FLANNEL_OPTIONS="--iface=eno16777736"
3.4 启动FLANNEL
可以使用service flanneld start 或者systemctl start flannel启动flannel
3.5 修改docker网络
因为docker需要使用flanneld的网络,因此需要修改docker的service文件:
[Unit]Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target rhel-push-plugin.socket
Wants=docker-storage-setup.service [Service] Type=notify NotifyAccess=all #import flannel configuration EnvironmentFile=-/etc/sysconfig/flanneld EnvironmentFile=-/run/flannel/subnet.env EnvironmentFile=-/etc/sysconfig/docker EnvironmentFile=-/etc/sysconfig/docker-storage EnvironmentFile=-/etc/sysconfig/docker-network Environment=GOTRACEBACK=crash ExecStart=/usr/bin/docker-current daemon \ --exec-opt native.cgroupdriver=systemd \ $OPTIONS \ $DOCKER_STORAGE_OPTIONS \ $DOCKER_NETWORK_OPTIONS \ $ADD_REGISTRY \ $BLOCK_REGISTRY \ $INSECURE_REGISTRY \ --bip=${FLANNEL_SUBNET} LimitNOFILE=1048576 LimitNPROC=1048576 LimitCORE=infinity TimeoutStartSec=0 MountFlags=slave Restart=on-abnormal [Install] WantedBy=multi-user.target
在执行前增加配置文件
EnvironmentFile=-/etc/sysconfig/flanneld
EnvironmentFile=-/run/flannel/subnet.env
执行命令增加参数 --bip=${FLANNEL_SUBNET}
重启docker
systemctl daemon-reloadsystemctl restart docker
3.6 问题
1、Failed to retrieve network config: 104: Not a directory (/flannel/network/config)
问题原因:在初次配置的时候,把flannel的配置文件中的etcd-prefix-key配置成了/flannel/network/config,实际上应该是/flannel/network
注意:如上配置需要在集群的所有机器上执行,完成后,上述安装的各个系统的启动顺序应该是:
systemctl start etcd
systemctl start flannel
systemctl start docker
配置完检查:
使用ip a检查当前的网络的准备情况:
[root@localhost system]# ip a1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:79:cf:e3 brd ff:ff:ff:ff:ff:ff inet 192.168.37.130/24 brd 192.168.37.255 scope global dynamic eno16777736 valid_lft 1554sec preferred_lft 1554sec inet6 fe80::20c:29ff:fe79:cfe3/64 scope link valid_lft forever preferred_lft forever 9: flannel0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1472 qdisc pfifo_fast state UNKNOWN qlen 500 link/none inet 172.17.75.0/16 scope global flannel0 valid_lft forever preferred_lft forever 10: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether 02:42:e3:f0:0d:05 brd ff:ff:ff:ff:ff:ff inet 172.17.75.1/24 scope global docker0 valid_lft forever preferred_lft forever
如果看到到flannel0余docker0的网段相同,则网络配置成功。
在第一次安装完3台机器集群后没有问题,后面过段时间后要加入一个新节点,就碰到很多坑了
如http://www.mamicode.com/info-detail-2194387.html 此文说到的
systemd启动etcd服务的时候出现错误:Failed at step CHDIR spawning /usr/bin/etcd: No such file or directory 解决办法:etcd.service服务配置文件中设置的工作目录WorkingDirectory=/var/lib/etcd/必须存在,否则会报以上错误
systemd启动etcd服务的时候出现错误:cannot assign requested address
解决办法:绑定阿里云的私网IP
也有https://blog.csdn.net/u010087956/article/details/53670468
通过systemd托管的etcd数据备份还原无法启动服务并且报错error listing data dir: /var/lib/etcd/default.etcd
1
但是单独执行启动命令可以
/usr/bin/etcd --debug --name=default --data-dir=/var/lib/etcd/default.etcd --listen-client-urls http://0.0.0.0:2379 --advertise-client-urls http://0.0.0.0:2380
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主要是还原目录时没有注意权限问题,systemd默认是以etcd用户执行的,这里需要修改default.etcd文件夹权限
chown etcd:etcd -R /var/lib/etcd/default.etcd
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参考文档
etcd can’t start due to status=1/FAILURE or status=200/CHDIR · Issue #3331 · coreos/etcd · GitHub
本文内容总结:1、ETCD安装,1.1 检查ETCD版本,1.2 安装ETCD,1.3 修改ETCD配置,2、Docker安装,2.1、检查docker版本,2.2 安装docker,2.3 检查docker安装信息,3 flannel,3.1 检查flannel版本,3.2 安装flannel,3.3 修改service配置,3.4 启动FLANNEL,3.5 修改docker网络,3.6 问题,注意:如上配置需要在集群的所有机器上执行,完成后,上述安装的各个系统的启动顺序应该是:,配置完检查:,
原文链接:https://www.cnblogs.com/devilwind/p/8880677.html
以上是 etcd安装和所遇到的坑 的全部内容, 来源链接: utcz.com/z/296980.html