作者归档：admin

wordpress 删除多余代码，加速前端加载 

function clean_head()
{
    // remove the links to the extra feeds such as category feeds
    remove_action('wp_head', 'feed_links_extra', 3);
    // remove REST API link tag
    remove_action('wp_head', 'rest_output_link_wp_head');
    // remove the link to the Really Simple Discovery service endpoint
    remove_action('wp_head', 'rsd_link');
    // remove the link to the Windows Live Writer manifest file
    remove_action('wp_head', 'wlwmanifest_link');
    // remove rel=canonical for singular queries
    remove_action('wp_head', 'rel_canonical');
    // remove relational links for the posts adjacent to the current post for single post pages
    remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10);
    // remove shortlink
    remove_action('wp_head', 'wp_shortlink_wp_head');
    // remove oEmbed
    remove_action('wp_head', 'wp_oembed_add_discovery_links');
    remove_action('wp_head', 'wp_oembed_add_host_js');
    // 移除 wordpress 信息，防止被恶意扫描
    remove_action('wp_head', 'wp_generator');
    // 移除cdn预读
    remove_action('wp_head', 'wp_resource_hints', 2);
    // 移除emoji
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('wp_print_styles', 'print_emoji_styles');
}

add_action('after_setup_theme', 'clean_head');

ubuntu 中利用 docker 搭建 php + oracle 开发环境

利用 docker 部署 oracle 11g

安装 docker

拉取镜像

docker pull sath89/oracle-xe-11g

创建实例

docker run -d --restart always -p 8080:8080 -p 1521:1521 -v /etc/localtime:/etc/localtime:ro -v /my/oracle/data:/u01/app/oracle sath89/oracle-xe-11g

<!–more–>

时间同步的参数详见： <http://jerry.red/453/docker-容器与宿主机时间不同步的解决办法>

连接信息

Connect database with following setting:

hostname: localhost
port: 1521
sid: xe
username: system
password: oracle
Password for SYS & SYSTEM:
oracle

Connect to Oracle Application Express web management console with following settings:

http://localhost:8080/apex
workspace: INTERNAL
user: ADMIN
password: oracle

镜像详情：<https://hub.docker.com/r/sath89/oracle-xe-11g/>，利用 daocloud.io 可加速拉取镜像。

安装 Oracle Instant Client

Install RPMs

  1. Download the Oracle Instantclient RPM files from http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html. Everyone needs either "Basic" or "Basic lite", and most users will want "SQL*Plus" and the "SDK".

  2. Convert these .rpm files into .deb packages and install using "alien" ("sudo apt-get install alien" if you don’t have it).

  3. For example, for version 12.1.0.2.0-1 for Linux x86_64 (64-bit):

alien -i oracle-instantclient12.1-basic-12.1.0.2.0-1.x86_64.rpm
alien -i oracle-instantclient12.1-sqlplus-12.1.0.2.0-1.x86_64.rpm
alien -i oracle-instantclient12.1-devel-12.1.0.2.0-1.x86_64.rpm
  1. Test your Instantclient install by using "sqlplus" or "sqlplus64" to connect to your database:
sqlplus system/oracle@//localhost:1521/xe

If you execute sqlplus and get "sqlplus: command not found", see the section below about adding the ORACLE_HOME variable.

If sqlplus complains of a missing libsqlplus.so file, follow the steps in the section "Integrate Oracle Libraries" below.

If sqlplus complains of a missing libaio.so.1 file, run

sudo apt-get install libaio1

or, if you’re installing the 32 bit instant client on 64 bit,

sudo apt-get install libaio1:i386

Integrate Oracle Libraries

If oracle applications, such as sqlplus, are complaining about missing libraries, you can add it to the system library list create a new file as follows:

sudo vi /etc/ld.so.conf.d/oracle.conf && sudo chmod o+r /etc/ld.so.conf.d/oracle.conf

and add the oracle library path as the first line. For example,

/usr/lib/oracle/12.1/client64/lib/

Then run ldconfig:

sudo ldconfig

ORACLE_HOME

Many Oracle database applications look for Oracle software in the location specified in the environment variable ‘ORACLE_HOME’.

Typical workstations will only have one Oracle install, and will want to define this variable in a system-wide location.

sudo vi /etc/profile.d/oracle.sh && sudo chmod o+r /etc/profile.d/oracle.sh

Add the following:

export ORACLE_HOME=/usr/lib/oracle/12.1/client64

Alternatively, each user can define this in their ~/.bash_profile

Note: From Ubuntu 11.04 (confirmed in 11.04 and 14.04) sqlplus was not recognized as a command unless the following line was also included in the oracle.sh file:

export PATH=$PATH:$ORACLE_HOME/bin

更多详情：<https://help.ubuntu.com/community/Oracle%20Instant%20Client>

安装 php 扩展

详见链接

linux下安装markdown编辑器Typora 

# or run:
# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BA300B7755AFCFAE
wget -qO - https://typora.io/linux/public-key.asc | sudo apt-key add -
# add Typora's repository
sudo add-apt-repository 'deb https://typora.io/linux ./'
sudo apt-get update
# install typora
sudo apt-get install typora

继续阅读 →

在sublime-text中使用OmniMarkupPreviewer预览时出现404错误的解决办法

这是一个安装了 OmniMarkupPreviewer 插件后，又缺少了依赖（比如重装系统）后才会出现的问题。见这篇文章。

错误现象：

Error: 404 Not Found

Quick Fix 1: Remove Strikethrough Extension

Sublime Text > Preferences > Package Settings > OmniMarkupPreviewer > Settings - User
paste the following to remove the strikeout package.

{
    "renderer_options-MarkdownRenderer": {
        "extensions": ["tables", "fenced_code", "codehilite"]
    }
}

继续阅读 →

RAID5的配置方法

RAID有 0 1 10 5 6 等级别，RAID0 的性能很强，但是万一有一块盘坏了，整个阵列就废了，肯定不能用。RAID1 的安全性最好，读取速度也不错，但浪费空间，四块盘只相当于两块盘的空间。

RAID5 是这么个原理：交替在各个盘上写数据，这么看类似于RAID0，但是每写n-1个盘的数据，剩下的那个盘写的就不是数据，而是校验数据（parity）。这样一来，如果有一块盘坏掉，那么就可以用剩下的盘上的数据来恢复数据。即便你临时无法找到另一块盘来替换坏盘，阵列也能进入降级模式，重要的数据也可以直接读取备份出来。
继续阅读 →

wordpress中如何用User Role Editor修改使用Meta Slider的权限

1、添加以下代码添加到functions.php

/**
 * You can change this to a different capability by pasting the code below into
 * your themes functions.php file.
 *
 * You can use the 'User Role Editor' plugin to add a custom capability to WordPress
 * specifically for Meta Slider users.
 */
function metaslider_change_required_role($capability) {
    return 'metaslider_use'; // this is the ID of a custom capability added using User Role Editor
}
add_filter('metaslider_capability', 'metaslider_change_required_role');

2、打开 用户 – User Role Editor
3、选择要修改权限用的角色
4、点击 Add Capability 添加 metaslider_use，然后钩选该属性
5、点击 Update – Yes

初级WordPress模板制作入门

一套完整的WordPress模板应至少具有如下文件：

style.css : CSS(样式表)文件
index.php : 主页模板
archive.php : Archive/Category模板
404.php : Not Found 错误页模板
comments.php : 留言/回复模板
footer.php : Footer模板
header.php : Header模板
sidebar.php : 侧栏模板
page.php : 内容页(Page)模板
single.php : 内容页(Post)模板
searchform.php : 搜索表单模板
search.php : 搜索结果模板

当然，具体到特定的某款模板，可能不止这些文件，但一般而言，这些文件是每套模板所必备的。
继续阅读 →

我是怎么防范 WordPress 大规模暴力破解攻击的

攻击者主要是首先扫描 WordPress 网站，然后通过穷举法攻击 WordPress 的默认用户名：admin。

其实可以通过以下三个步骤来减少被攻击以及被攻陷的机会：

1、 在当前 functions.php 添加以下代码去掉 WordPress 版本信息，减少被扫描到的机会。

remove_action( 'wp_head', 'wp_generator');

2、 默认的用户名不要为 admin，通过一下 SQL 修改 admin 的用户名：

UPDATE wp_users SET user_login = 'newuser' WHERE user_login =  'admin';

3、 安装 Limit Login Attempts 插件，限制登陆尝试次数，防止通过穷举法获取后台密码。