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开启log-bin硬盘总满，不开启log-bin表总crash，纠结啊纠结啊

一、编辑虚拟机虚拟磁盘大小

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echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce

net.ipv4.conf.eth0.arp_ignore = 1
net.ipv4.conf.eth0.arp_announce = 2

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如果直接使用irb命令，在使用gem的时候会出现NoMethodError: undefined method `gem' for main:Object的错误提示

此时可以使用irb –r rubygems来启动，则可解决

或者还有一种办法，在irb启动手，手动载入rubygems

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一、在模板中应该有控制器名称的定义

<%= content_tag :body, :class => "#{controller.controller_name}" do %>
<% end %>

二、在CSS中应该有针对控制器的过滤

.topics {
  .topic {

    border-bottom: 1px #CCC solid;
    padding: 4px 0px;

    .title {
      font-size: 14px;
    }
    .attachments_count {
      color: #999;
    }
    .comments_count {
      color: #999;
    }
    .updated_at {
      color: #999;
    }

  }
}

<%= f.fields_for :attachments do |fields| %>
  <%= fields.file_field :uploaded_file %>
<% end %>

David added a very cool feature to Rails recently – Signed cookies and permanent cookies This lets you set permanent and/or signed cookies very easily.

Before this, you’d have to write :

cookies[:user_preference] = {
  :value => @current_user.preferences,
  :expires => 20.years.from_now.utc
}

Now just becomes :

cookies.permanent[:user_preference] = @current_user.preferences

In case you happen to have seen my Railssummit presentation I had talked about using ActiveSupport::MessageVerifier for implementing “Remember me” functionality. The above commit makes that a whole lot easier.

In your model User.rb :

# User.rb
def self.authenticated_with_token(id, stored_salt)
  u = find_by_id(user_id)
  u && u.salt == stored_salt ? u : nil
end

And when the user checks “Remember me” box, make sure the following gets run :

cookies.permanent.signed[:remember_me] = [current_user.id, current_user.salt]

This will set a permanent and signed cookie using the secret specified in ActionController::Base.cookie_verifier_secret. If you don’t have the cookie_verifier_secret defined, you might want to do that in one of the initializers.

Now when you want to login using the cookie :

user = User.authenticated_with_token(*cookies.signed[:remember_me])

In this specific case, it’s very important to use the salt in the cookie value. That makes sure the cookie gets invalidated if the user changes his password.

　　Win7 NFS客户端使用mount命令挂载NFS服务之后，文件系统对Win7只读，无法写入文件，无法新建文件夹，此时使用mount命令可以查看到如下状态：

　　可以看到UID=-2由于在存储设备上共享出来的NFS文件系统归属于root权限，并且无法修改该所属用户，而Windows通过UID=-2的用户去写，肯定写不进去。

　　解决办法就是让Win7在挂载NFS的时候将UID和GID改成0即可：打开注册表：HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ClientForNFS\CurrentVersion\Default，增加两项：AnonymousUid，AnonymousGid

　　重新启动计算机，重新mount

　　然后就可以正常写入文件了