4、设置完MariaDB的密码后，使用命令行登录MariaDB，并为Nextcloud创建相应的用户和数据库。
例如数据库为nextcloud_db，用户为nextclouduser，密码为nextcloudpasswd：
[root@nextcloud-server ~]# mysql -p
......
MariaDB [(none)]> create database nextcloud_db;
MariaDB [(none)]> create user nextclouduser@localhost identified by ‘nextcloudpasswd‘;
MariaDB [(none)]> grant all privileges on nextcloud_db.* to nextclouduser@localhost identified by ‘nextcloudpasswd‘;
MariaDB [(none)]> flush privileges;
MariaDB [(none)]> \q

三、为Nextcloud生成自签名SSL证书
1、cd /etc/nginx
mkdir cert
cd /etc/nginx/cert/
openssl req -new -x509 -days 365 -nodes -out /etc/nginx/cert/nextcloud.crt -keyout /etc/nginx/cert/nextcloud.key
.....
Country Name (2 letter code) [XX]:cn //国家
State or Province Name (full name) []:beijing //省份
Locality Name (eg, city) [Default City]:beijing //地区名字
Organization Name (eg, company) [Default Company Ltd]:kevin //公司名
Organizational Unit Name (eg, section) []:Technology //部门
Common Name (eg, your name or your server‘s hostname) []:kevin //CA主机名
Email Address []:kevin@wangshibo.cn

×××和文件夹权限
$ chmod 600 /etc/nginx/cert/*
$ chmod 700 /etc/nginx/cert
四、下载并安装Nextcloud
yum -y install wget unzip
cd /usr/local/src/
wget https://download.nextcloud.com/server/releases/nextcloud-14.0.3.zip
unzip nextcloud-14.0.3.zip
ls
mv nextcloud /usr/share/nginx/html/

进入Nginx的root目录，并为Nextcloud创建data目录，将Nextcloud的用户和组修改为nginx

cd /usr/share/nginx/html/
mkdir -p nextcloud/data/
chown nginx:nginx -R nextcloud/

五、设置Nginx虚拟主机

进入Nginx的虚拟主机配置文件所在目录并创建一个新的虚拟主机配置（记得修改两个server_name为自己的域名）
*小白要注意：
我的云主机中需要将listen 443改为442，listen80改为81，并在安全组中对这两个端口进行放行。这里困惑了很久，因为服务商关闭了80和443端口，所以，我修改为其他的，同时在云主机—安全组中，要对这两个端口进行放行（你如果备案的话，就不存在修改端口号的问题，只需要在安全组中进行放行）
cd /etc/nginx/conf.d/
vim nextcloud.conf
upstream php-handler {
server 127.0.0.1:9000;
#server unix:/var/run/php5-fpm.sock;
}

server {
listen 80;
server_name xxx.com;

enforce https

return 301 https://$server_name$request_uri;

}

server {
listen 443 ssl;
server_name xxx.com;

ssl_certificate /etc/nginx/cert/nextcloud.crt;
ssl_certificate_key /etc/nginx/cert/nextcloud.key;

# Add headers to serve security related headers
# Before enabling Strict-Transport-Security headers please read into this
# topic first.
add_header Strict-Transport-Security "max-age=15768000;
includeSubDomains; preload;";
add_header X-Content-Type-Options nosniff;
add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
add_header X-Robots-Tag none;
add_header X-Download-Options noopen;
add_header X-Permitted-Cross-Domain-Policies none;

# Path to the root of your installation
root /usr/share/nginx/html/nextcloud/;

location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
}

# The following 2 rules are only needed for the user_webfinger app.
# Uncomment it if you‘re planning to use this app.
#rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
#rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json
# last;

location = /.well-known/carddav {
  return 301 $scheme://$host/remote.php/dav;
}
location = /.well-known/caldav {
  return 301 $scheme://$host/remote.php/dav;
}

# set max upload size
client_max_body_size 512M;
fastcgi_buffers 64 4K;

# Disable gzip to avoid the removal of the ETag header
gzip off;

# Uncomment if your server is build with the ngx_pagespeed module
# This module is currently not supported.
#pagespeed off;

error_page 403 /core/templates/403.php;
error_page 404 /core/templates/404.php;

location / {
    rewrite ^ /index.php$uri;
}

location ~ ^/(?:build|tests|config|lib|3rdparty|templates|data)/ {
    deny all;
}
location ~ ^/(?:\.|autotest|occ|issue|indie|db_|console) {
    deny all;
}

location ~ ^/(?:index|remote|public|cron|core/ajax/update|status|ocs/v[12]|updater/.+|ocs-provider/.+|core/templates/40[34])\.php(?:$|/) {
    include fastcgi_params;
    fastcgi_split_path_info ^(.+\.php)(/.*)$;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $fastcgi_path_info;
    fastcgi_param HTTPS on;
    #Avoid sending the security headers twice
    fastcgi_param modHeadersAvailable true;
    fastcgi_param front_controller_active true;
    fastcgi_pass php-handler;
    fastcgi_intercept_errors on;
    fastcgi_request_buffering off;
}

location ~ ^/(?:updater|ocs-provider)(?:$|/) {
    try_files $uri/ =404;
    index index.php;
}

# Adding the cache control header for js and css files
# Make sure it is BELOW the PHP block
location ~* \.(?:css|js)$ {
    try_files $uri /index.php$uri$is_args$args;
    add_header Cache-Control "public, max-age=7200";
    # Add headers to serve security related headers (It is intended to
    # have those duplicated to the ones above)
    # Before enabling Strict-Transport-Security headers please read into
    # this topic first.
    add_header Strict-Transport-Security "max-age=15768000;includeSubDomains; preload;";
    add_header X-Content-Type-Options nosniff;
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Robots-Tag none;
    add_header X-Download-Options noopen;
    add_header X-Permitted-Cross-Domain-Policies none;
    # Optional: Don‘t log access to assets
    access_log off;
}

location ~* \.(?:svg|gif|png|html|ttf|woff|ico|jpg|jpeg)$ {
    try_files $uri /index.php$uri$is_args$args;
    # Optional: Don‘t log access to other assets
    access_log off;
}

}

接下来测试以下配置文件是否有错误，确保没有问题后重启Nginx服务。
[root@nextcloud-server conf.d]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@nextcloud-server conf.d]# systemctl restart nginx

七、安装Nextcloud
解析上面nginx中配置的域名nextcloud.kevin-inc.com，访问访问http://nextcloud.kevin-inc.com进行Nextcloud界面安装（访问http域名会自动跳转到https，安装提示安装即可！）

重要的地方来了，因为各位大神都是左写一部分，右写一部分，所有我花费了很多时间来配置，下面我将我的一些错误的解决标识出来：
一、解决内存缓存问题：
1、安装redis
yum install redis -y
systemctl start redis
systemctl enable redis
ps ax | grep redis
2、安装扩展：php-redis

原则：安装和php版本一致的扩展
解决办法
a.通过命令查看当前php版本
php -v
b.列出所有的可以安装的php软件包列表
yum list | grep php7
c、查看redis包全名并安装
yum install php70w-pecl-redis.x86_64
d.重启php-fpm
systemctl restart php-fpm
3、编辑配置文件
cd /usr/share/nginx/html/nextcloud/config/
cp config.php config.php.bak
vi config.php
‘memcache.local‘ => ‘\OC\Memcache\Redis‘,
‘redis‘ => array(
‘host‘ => ‘localhost‘,
‘port‘ => 6379,
),

systemctl restart nginx
systemctl start redis
systemctl enable redis
二、解决：The PHP OPcache module is not loaded.问题
1、find / -name “php.ini” 找到php.ini文件
2、备份php.ini cp /etc/php.ini /etc/php.ini.bak
3、下载对应php版本的OPcache
a、yum list | grep php7
b、安装
yum install php70w-opcache.x86_64
c、重启php-fpm
systemctl restart php-fpm
4、编辑opcache配置文件：
位置：/etc/php.d/opcache.ini
vi /etc/php.d/opcache.ini
opcache.enable=1
opcache.enable_cli=1
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.memory_consumption=128
opcache.save_comments=1
opcache.revalidate_freq=1
三、 centos7 里搭建的nextcloud后无法登录

创建并设置 /var/lib/php/session 目录权限后问题解决。
chown nginx:nginx -R /var/lib/php/session/
四、 内部服务器错误：

cd /usr/share/nginx/html/
chown nginx:nginx -R nextcloud/
五、定时任务解决：

centos7中定时任务设置：
1、进入目录：
cd /etc/systemd/system/
2、创建文件
vi nextcloudcron.service

[Unit]
Description=Nextcloud cron.php job
[Service]
User=nginx
ExecStart=/usr/bin/php -f /usr/share/nginx/html/nextcloud/cron.php
[Install]
WantedBy=basic.target

将nginx和 /usr/share/nginx/html/nextcloud/cron.php保存为自己的用户名和地址
保存退出
3、创建nextcloudcron.timer
[Unit]
Description=Run Nextcloud cron.php every 15 minutes
[Timer]
OnBootSec=5min
OnUnitActiveSec=15min
Unit=nextcloudcron.service
[Install]
WantedBy=timers.target
4、运行
systemctl start nextcloudcron.timer
systemctl enable nextcloudcron.timer

原文：http://blog.51cto.com/774579/2320775