用户数据bash脚本用于启动EC2实例中的服务未执行

我'm having difficulty getting certain services running within my EC2 instance. I'使用亚马逊Linux AMI，并希望在我的实例首次启动时启动图形数据库 neo4j 作为服务 .

但是，我一直无法开始任何事情，更不用说 neo4j 了 . 我甚至无法获得亚马逊提供的基本tutorial user data script工作 . 我复制并粘贴了以下代码：

#!/bin/bash
yum update -y
yum install -y httpd24 php56 mysql55-server php56-mysqlnd
service httpd start
chkconfig httpd on

进入我的EC2实例的用户数据部分，然后启动我的EC2实例 . 从理论上讲，自 httpd 启动以来，我应该能够在浏览器中导航到我的实例的IP地址并查看默认的Apache网页（我已经允许在端口80处使用入站HTTP进行安全组设置） . 但是，我收到 Connection refused 错误 .

在SSH进入我的实例后发出以下命令时，会确认这一点：

sudo su service httpd status

响应是 httpd is stopped ，显然用户数据脚本应该启动它 . 亚马逊建议调试我检查 /var/log/cloud-init-output.log 是否有错误消息，但是当我检查日志时我没有看到任何消息：

Cloud-init v. 0.7.6 running 'init-local' at Sun, 12 Nov 2017 16:41:03 +0000. Up 5.73 seconds.
Cloud-init v. 0.7.6 running 'init' at Sun, 12 Nov 2017 16:41:03 +0000. Up 5.91 seconds.
ci-info: +++++++++++++++++++++++Net device info+++++++++++++++++++++++
ci-info:  Device   Up     Address         Mask          Hw-Address    
ci-info:    lo    True   127.0.0.1     255.0.0.0            .         
ci-info:   eth0   True  172.31.7.27  255.255.240.0  0a:8c:a2:67:1f:46 
ci-info: ++++++++++++++++++++++++++++++Route info+++++++++++++++++++++++++++++++
ci-info:  Route    Destination     Gateway        Genmask      Interface  Flags 
ci-info:    0        0.0.0.0      172.31.0.1      0.0.0.0         eth0      UG  
ci-info:    1    169.254.169.254   0.0.0.0    255.255.255.255     eth0      UH  
ci-info:    2       172.31.0.0     0.0.0.0     255.255.240.0      eth0      U   
Generating public/private rsa key pair.
Your identification has been saved in /etc/ssh/ssh_host_rsa_key.
Your public key has been saved in /etc/ssh/ssh_host_rsa_key.pub.
The key fingerprint is:
...
The key's randomart image is:
+---[RSA 2048]----+
[RANDOM ART]
+----[SHA256]-----+
Generating public/private dsa key pair.
Your identification has been saved in /etc/ssh/ssh_host_dsa_key.
Your public key has been saved in /etc/ssh/ssh_host_dsa_key.pub.
The key fingerprint is:
...
The key's randomart image is:
+---[DSA 1024]----+
+----[SHA256]-----+
Generating public/private ecdsa key pair.
Your identification has been saved in /etc/ssh/ssh_host_ecdsa_key.
Your public key has been saved in /etc/ssh/ssh_host_ecdsa_key.pub.
The key fingerprint is:
...
The key's randomart image is:
... [RANDOMART IMAGE]
Cloud-init v. 0.7.6 running 'modules:config' at Sun, 12 Nov 2017 16:41:04 +0000. Up 6.70 seconds.
Loaded plugins: priorities, update-motd, upgrade-helper
No packages needed for security; 0 packages available
No packages marked for update
Cloud-init v. 0.7.6 running 'modules:final' at Sun, 12 Nov 2017 16:41:08 +0000. Up 10.93 seconds.
Cloud-init v. 0.7.6 finished at Sun, 12 Nov 2017 16:41:08 +0000. Datasource DataSourceEc2.  Up 11.04 seconds
Cloud-init v. 0.7.6 running 'init-local' at Sun, 12 Nov 2017 17:10:45 +0000. Up 5.85 seconds.
Cloud-init v. 0.7.6 running 'init' at Sun, 12 Nov 2017 17:10:46 +0000. Up 6.04 seconds.
ci-info: +++++++++++++++++++++++Net device info+++++++++++++++++++++++
ci-info:  Device   Up     Address         Mask          Hw-Address    
ci-info:    lo    True   127.0.0.1     255.0.0.0            .         
ci-info:   eth0   True  172.31.7.27  255.255.240.0  0a:8c:a2:67:1f:46 
ci-info: ++++++++++++++++++++++++++++++Route info+++++++++++++++++++++++++++++++
ci-info:  Route    Destination     Gateway        Genmask      Interface  Flags 
ci-info:    0        0.0.0.0      172.31.0.1      0.0.0.0         eth0      UG  
ci-info:    1    169.254.169.254   0.0.0.0    255.255.255.255     eth0      UH  
ci-info:    2       172.31.0.0     0.0.0.0     255.255.240.0      eth0      U   
Cloud-init v. 0.7.6 running 'modules:config' at Sun, 12 Nov 2017 17:10:46 +0000. Up 6.61 seconds.
Cloud-init v. 0.7.6 running 'modules:final' at Sun, 12 Nov 2017 17:10:47 +0000. Up 7.03 seconds.
Cloud-init v. 0.7.6 finished at Sun, 12 Nov 2017 17:10:47 +0000. Datasource DataSourceEc2.  Up 7.11 seconds
Cloud-init v. 0.7.6 running 'init-local' at Sun, 12 Nov 2017 17:18:25 +0000. Up 5.60 seconds.
Cloud-init v. 0.7.6 running 'init' at Sun, 12 Nov 2017 17:18:25 +0000. Up 5.79 seconds.
ci-info: +++++++++++++++++++++++Net device info+++++++++++++++++++++++
ci-info:  Device   Up     Address         Mask          Hw-Address    
ci-info:    lo    True   127.0.0.1     255.0.0.0            .         
ci-info:   eth0   True  172.31.7.27  255.255.240.0  0a:8c:a2:67:1f:46 
ci-info: ++++++++++++++++++++++++++++++Route info+++++++++++++++++++++++++++++++
ci-info:  Route    Destination     Gateway        Genmask      Interface  Flags 
ci-info:    0        0.0.0.0      172.31.0.1      0.0.0.0         eth0      UG  
ci-info:    1    169.254.169.254   0.0.0.0    255.255.255.255     eth0      UH  
ci-info:    2       172.31.0.0     0.0.0.0     255.255.240.0      eth0      U   
Cloud-init v. 0.7.6 running 'modules:config' at Sun, 12 Nov 2017 17:18:26 +0000. Up 6.41 seconds.
Cloud-init v. 0.7.6 running 'modules:final' at Sun, 12 Nov 2017 17:18:26 +0000. Up 6.84 seconds.
Cloud-init v. 0.7.6 finished at Sun, 12 Nov 2017 17:18:26 +0000. Datasource DataSourceEc2.  Up 6.93 seconds

我查看了StackOverflow上的类似帖子，发现了这个：user data script doesn't launch with ec2 instance . 接受的答案是用户数据脚本只在第一个启动周期执行 - 这是否意味着我需要终止我的实例并启动一个全新的实例才能执行我的脚本？在这种情况下，我觉得这首先打破了启动脚本的整个目的！

编辑：我添加了几个 echo 测试语句，看看它们是否在日志中打印出来！

但是，我确实从我的EC2实例中尝试了 curl http://169.254.169.254/latest/meta-data ，并获得了这个输出：

#!/bin/bash
echo "Testing 1"
yum update -y
echo "Testing 2"
yum install -y httpd24 php56 mysql55-server php56-mysqlnd
echo "Testing 3"
service httpd start
chkconfig httpd on

所以它肯定会加载我的用户数据......只是没有执行它 .