centos 6.5安裝docker和jenkins詳解

因公司項目的要求,讓我在今天把docker和jenkins搭建起來,我在搭建成功後,把其中遇到的問題和解決辦法記錄下來分享給大家.
 系統:centos 6.5(64位)
1.先查看核心是否是3.10
uname -r

如果不是3.10的執行下面的命令:
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -ivh http://www.elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm

安裝kernel-lt（lt=long-term）
yum --enablerepo=elrepo-kernel install kernel-lt -y
或者安裝kernel-ml（ml=mainline）
yum --enablerepo=elrepo-kernel install kernel-ml -y

ps:請自己根據需要來選擇上面的核心.

編輯grub.conf檔案,修改Grub引導順序
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root
#          initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.10.94-1.el6.elrepo.x86_64)
    root (hd0,0)
    kernel /vmlinuz-3.10.94-1.el6.elrepo.x86_64 ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
    initrd /initramfs-3.10.94-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-431.el6.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
    initrd /initramfs-2.6.32-431.el6.x86_64.img

確認剛安裝好的核心在哪個位置,然後設定default值(從0開始),一般新安裝的核心在第一個位置.所以設定default=0

2.安裝docker
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
yum -y install docker-io*
service docker start
chkconfig docker on

如果啟動docker出現如下錯誤:
/usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference

請執行下面的命令:
yum install device-mapper-event-libs

如果沒問題了的話,我們來驗證下docker,執行下面的命令:
docker --version
Docker version 1.7.1, build 786b29d/1.7.1

我這裡顯示的1.7.1的版本.好了,下面我們可以用docker來安裝jenkins了.

3.docker安裝jenkins
docker pull jenkinsci/jenkins

ps:因為我們項目指定了要這個

如果出現下面的錯誤:
unable to get remote tags: Get https://registry-1.docker.io/v1/repositories/library/jenkins/tags: dial tcp 218.93.250.18:443: connection timed out

請執行:
dig index.docker.io +noall +answer +nocomments
我這裡看到有3個ip,如下:
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6_7.5 <<>> index.docker.io +noall +answer +nocomments
;; global options: +cmd
index.docker.io.    251    IN    CNAME    elb-io.us-east-1.aws.dckr.io.
elb-io.us-east-1.aws.dckr.io. 530 IN    CNAME    us-east-1-elbio-rm5bon1qaeo4-623296237.us-east-1.elb.amazonaws.com.
us-east-1-elbio-rm5bon1qaeo4-623296237.us-east-1.elb.amazonaws.com. 31 IN A 54.164.250.255
us-east-1-elbio-rm5bon1qaeo4-623296237.us-east-1.elb.amazonaws.com. 31 IN A 54.152.78.181
us-east-1-elbio-rm5bon1qaeo4-623296237.us-east-1.elb.amazonaws.com. 31 IN A 52.0.10.162

我隨便選了個ip加到hosts裡
echo '54.208.179.150 registry-1.docker.io' >> /etc/hosts

然後再執行
docker pull jenkinsci/jenkins

如果下載成功了的話,我們來驗證下:
docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
jenkinsci/jenkins   latest              bbb3fdd65bef        3 days ago          882.6 MB

ps:docker images 指令可以查詢目前已pull回?淼?mage的清單及簡易的資訊?熱?
好了,然後我們來啟動jenkins:
docker run -d -p 8080:8080 jenkinsci/jenkins
如果啟動的時候報以下錯誤:
Cannot start container f12cdd095c6fcfc759e7986276b49d3647e02cc50e55ce9cf1559ed249617281: iptables failed: iptables -t nat -A DOCKER -p tcp -d 0/0 --dport 8080 -j DNAT --to-destination 172.17.0.8:8080 ! -i docker0: iptables: No chain/target/match by that name.\n (exit status 1)

解決辦法:

*nat
:PREROUTING ACCEPT [27:11935]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [598:57368]
:POSTROUTING ACCEPT [591:57092]
:DOCKER - [0:0]
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE
COMMIT
*filter
:INPUT ACCEPT [139291:461018923]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [127386:5251162]
:DOCKER - [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -o docker0 -j DOCKER
-A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i docker0 ! -o docker0 -j ACCEPT
-A FORWARD -i docker0 -o docker0 -j ACCEPT
COMMIT

然後儲存退出並重啟iptables.再來啟動jenkins:
docker run -d -p 8080:8080 jenkinsci/jenkins

然後在瀏覽器裡進行驗證:
http://ip:8080