在ubuntu 和rhel 7.2 上使用devstack 安装openstack

我的感觉是devstack 对ubuntu 的支持比较好。
ubuntu 上一切都很简单，我使用的是Ubuntu 14.04 LTS 
准备环境，查看防火墙。

apt-get update
iptables -nvL

开始安装：

sudo git clone https://git.openstack.org/openstack-dev/devstack
sudo su - root
/devstack/tools/create-stack-user.sh
chown -R stack.stack  /devstack/
su - stack
cd /devstack
cp samples/local.conf ./

修改local.conf

ADMIN_PASSWORD=pass
DATABASE_PASSWORD=pass
RABBIT_PASSWORD=pass

开始安装：10分钟后，openstack 就装好了。

./stack.sh

Rhel 7.2 就要烦很多：先disable iptables,  disable selinux.
1. 装brctl. 此处略过下载，创建stack 用户和修改conf文件的过程。

yum makecache
yum provides brctl
yum install bridge-utils-1.5-9.el7.x86_64

2. 出错的log 看起来很烦，

vim vim /opt/stack/logs/stack.sh.log.2016-03-29-032832
2016-03-29 07:29:54.179 | ++^[[3242mfunctions-common:yum_install:1353        ^[(B^[[m die 'Detected fatal package install failure'
2016-03-29 07:29:54.183 | ++^[[3242mfunctions-common:die:186                 ^[(B^[[m local exitcode=0
2016-03-29 07:29:54.187 | [Call Trace]
2016-03-29 07:29:54.187 | ./stack.sh:713:source
2016-03-29 07:29:54.187 | /usr/local/devstack/tools/install_prereqs.sh:72:install_package
2016-03-29 07:29:54.187 | /usr/local/devstack/functions-common:1277:real_install_package
2016-03-29 07:29:54.187 | /usr/local/devstack/functions-common:1265:yum_install
2016-03-29 07:29:54.187 | /usr/local/devstack/functions-common:1353:die
2016-03-29 07:29:54.189 | [ERROR] /usr/local/devstack/functions-common:Detected fatal
2016-03-29 07:29:55.198 | Error on exit

然后看functions-common: 1353 行：

function yum_install {
    local result parse_yum_result

    [[ "$OFFLINE" = "True" ]] && return

    time_start "yum_install"

    # - We run with LC_ALL=C so string matching *should* be OK
    # - Exit 1 if the failure might get better with a retry.
    # - Exit 2 if it is fatal.
    parse_yum_result='             \
        BEGIN { result=0 }         \
        /^YUM_FAILED/ { exit $2 }  \
        /^No package/ { result=2 } \
        /^Failed:/    { result=2 } \
        //{ print }                \
        END { exit result }'

    # The manual check for missing packages is because yum -y assumes
    # missing or failed packages are OK.
    # See https://bugzilla.redhat.com/show_bug.cgi?id=965567
    (sudo_with_proxies "${YUM:-yum}" install -y "$@" 2>&1 || echo YUM_FAILED $?) \
        | awk "$parse_yum_result" && result=$? || result=$?

    time_stop "yum_install"

    # if we return 1, then the wrapper functions will run an update
    # and try installing the package again as a defense against bad
    # mirrors. This can hide failures, especially when we have
    # packages that are in the "Failed:" section because their rpm
    # install scripts failed to run correctly (in this case, the
    # package looks installed, so when the retry happens we just think
    # the package is OK, and incorrectly continue on).
    if [ "$result" == 2 ]; then
        die "Detected fatal package install failure"
    fi

    return "$result"
}

可以断定：'Detected fatal package install failure' 意味着yum install -y 某个包出错，在log里面一顿找，发现有些包没有找到，手动装上。

3. 又碰上mariadb 的问题，我安装了更新的 mariadb-libs. 
log 如下： 

2016-03-30 06:27:05.304 | ---> Package perl-Co+^[[3242mfunctions-common:yum_install:1340        ^[(B^[[m echo YUM_FAILED 1
2016-03-30 06:27:05.304 | mpress-Raw-Zlib.x86_64 1:2.061-4.el7 will be installed
2016-03-30 06:27:05.304 | --> Finished Dependency Resolution
2016-03-30 06:27:05.304 | Error: Package: 1:mariadb-server-5.5.44-2.el7.x86_64 (rhel-x86_64-server-7)
2016-03-30 06:27:05.304 | Requires: mariadb-libs(x86-64) = 1:5.5.44-2.el7
2016-03-30 06:27:05.304 |            Installed: 1:mariadb-libs-5.5.47-1.el7_2.x86_64

卸载掉继续。

总结下： Ubuntu 14.04 LTS 使用devstack 装openstack ，一路绿灯，没有报错。
Rhel 7.2 出错10次左右，自己手动卸载或者安装N个。
Centos 7.2 可以参考： 
http://www.cnblogs.com/lsyu/p/5142876.html