我从亚马逊发起了一个EC2 t2.micro实例，尝试使用命令安装MySQL服务器：
sudo yum install mysql-community-server
我收到了以下错误：
Error: Package: mysql-community-server-5.7.9-1.el7.x86_64 (mysql57-community)
Requires: systemd
我尝试按照this post安装systemd命令，但我收到以下错误：
/usr/include/linux/loop.h:58:2: error: unknown type name '__u64'
__u64 lo_init[2];
^
In file included from /usr/include/netinet/if_ether.h:25:0,
from /usr/include/netinet/ether.h:25,
from ./src/shared/socket-util.h:26,
from ./src/core/unit.h:39,
from ./src/core/busname.h:27,
from src/libsystemd/sd-bus/bus-kernel.h:26,
from src/libsystemd/sd-bus/bus-internal.h:38,
from src/libsystemd/sd-bus/bus-objects.c:26:
/usr/include/linux/if_ether.h:140:2: error: unknown type name '__be16'
__be16 h_proto; /* packet type ID field */
^
In file included from ./src/shared/socket-util.h:30:0,
from ./src/core/unit.h:39,
from ./src/core/busname.h:27,
from src/libsystemd/sd-bus/bus-kernel.h:26,
from src/libsystemd/sd-bus/bus-internal.h:38,
from src/libsystemd/sd-bus/bus-objects.c:26:
/usr/include/linux/if_packet.h:9:2: error: unknown type name '__be16'
__be16 spkt_protocol;
^
/usr/include/linux/if_packet.h:14:2: error: unknown type name '__be16'
__be16 sll_protocol;
^
/usr/include/linux/if_packet.h:195:2: error: unknown type name '__aligned_u64'
__aligned_u64 seq_num;
来自uname -a命令的结果：Linux ip-172-31-19-10 4.1.7-15.23.amzn1.x86_64 #1 SMP Mon Sep 14 23:20:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
在CentOS7中systemd命令是新的时，想知道为什么在这个实例中缺少systemd命令？
我无法找出任何问题？