AWS常见问题

1. 我的网站为何显示空白页面？

ELB/ALB 有一个参数Idle timeout，默认为60秒，当执行一个请求时，如果后台执行超时就会显示空白页面。

2. Disconnected: No supported authentication methods available(server sent: publickey,gssapi-keyex,gssapi-with-mic)

用Centos 7 AMI创建了EC2 Instance，Putty连接时报这个错误，原因是用户名错了，Centos 7的用户名不是ec2-user，也不是root，是centos。

Error: Host key not found, Permission denied (publickey), or Authentication failed, permission denied

3. Redhat 7 如何设置DNS

编辑文件 /etc/sysconfig/network-scripts/ifcfg-eth0

修改其中的PEERDNS项

PEERDNS="no"

然后增加DNS，如：

DNS1="10.184.13.14"
DNS2="10.184.13.4"

重启系统后，文件/etc/resolv.conf中会自动增加DNS配置（如只在此文件中配置DNS，重启后会丢失）

4.Install CFN script for Centos7

#!/bin/bash
# Setup CentOS 7 host as AMI

# Update base OS update, and install EPEL repo and Python Pip
sudo yum -y update
sudo yum –y install epel-release
sudo yum -y install python-pip

# Install Python add-ons:
sudo pip install pystache 
sudo pip install argparse
sudo pip install python-daemon
sudo pip install requests

# Install CFN-BootStrap from source
curl -sSL https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz | sudo tar -xpf -C - /opt
cd /opt/aws-cfn-bootstrap-1.4/
sudo python setup.py build
sudo python setup.py install
# Configure CFN
sudo ln -s /usr/init/redhat/cfn-hup /etc/init.d/cfn-hup
sudo chmod 775 /usr/init/redhat/cfn-hup
cd /opt
sudo mkdir aws
cd aws
sudo mkdir bin
ln -s /usr/bin/cfn-hup /opt/aws/bin/cfn-hup

用easy_install更简单：

# easy_install --script-dir /opt/aws/bin https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz

安装新版本的easy_install

# curl -O https://bootstrap.pypa.io/ez_setup.py

# python ez_setup.py

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5. 使用CloudFormation创建Security Group，能否设置Group Name?

目前还不能。目前支持自定义Name的资源类型请参见Name Type

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