If you want to know Ruby，Ruby or want to install several software packages on your computer，You can easily use RubyGems a key to download - just like in the Ubuntu apt-get、Similar redhat in the yum etc.。
so，Want to install Ruby packages，You will need to gem。but，In addition to installing gem (if your computer is Linux or osx，It may have been built，Use the command "gem -v" to verify)
But the version may[……]
In use xcode Make a program when，We generally use some pictures instead of stiff off button text，Make the interface more beautiful。
but，When adding pictures，I met when editing storyboard You can display，But the problem when the program is running, but can not be displayed。
View Record found error：
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1 |
Could not load the image referenced from a nib in the bundle running on device |
Nations on swift Development of documentation and Q is too small，Even the tutorial is ambiguous - it[……]
This afternoon，I'm knocking Code，Then on the west coast, a vps sent e-mail，Said server to restart Update，And I happen to have a vps is there in his。In addition to hardware and general maintenance accident，Cloud services basically online - after all，“High availability"It is the main subject of cloud services。
but，This time is different，Just today，The new virtual machine loopholes available，Exploit this vulnerability，You can make every minuteBreakthrough virtual machine restrictionsAnd get to the other servers in the same server access! Then use the information to other servers，And then we can continue in-depth infiltration[……]
Possible until now，You have been very skilled how to open nat and port forwarding on Linux - after all, this operation may also require a server at the time of deployment。But its operation is too cumbersome，Especially when we use edit iptables ufw after that，But you can not directly edit the iptables，This time in the end what to do it?
wantUse ufw to open nat masquerading and port forwarding，You can refer to this articleUnder Ubuntu more simple firewall Uncompli[……]
Update：for some reason，Ali cloud is no longer recommended updates the source，Give youThis page，Click to go can help you generate USTC mirror automatically depending on the version update source。
In order to facilitate their own domestic vps server configuration updates，Usually all you need to change and update the source dns，Do not try to patch ............ otherwise life short，NetEase previously used source but recently always cramp，So nowRecommended Ali cloud。
Another，You can enter "in a terminal serverlsb_release -a"Command or see"/etc/issue"file[……]
we all know，Among Linux system has a very fast hardware firewall is called iptables，It can do far exceeds the scope of the firewall, but ......，usually，We only used it as a firewall to use。
but，If you just want a port policy，That does not seem to need to face iptables That lengthy configuration commands。Now，I'll introduce you to the other, a more simple firewall：
A very clear look at the name "uncomplicated fire[……]
As the once booming domestic DNS resolution service providers，dnspod In the godaddy NS has just been certified during that time to resolve domestic high speed services of good quality and recommended by the majority of Web hosting providers，Our group of mindless small bloggers will have to takeThird-party NS resolution。
Actually, I was dnspod It's nice, too，Resolved faster，Creates a new domain name，Starting from a few minutes to take effect now only takes a few seconds to，Really make a lot of heart--in addition to being attacked，Ok，Good now。
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We all know that you can use nginx trans-generation capabilities to achieve cross-border access network，but，This approach has a lot of constraints，For example, it is difficult to achieve login authentication，For example, the need for a separate forwarding module compiler to do，For example, you need to have a valid signature ssl certificates, etc.。
this time，We introduce an additional artifact SNI Proxy，With dnsmasq with sniproxy certificate can be achieved without any anti-Site Generation。It uses technology to SNI TLS connection via TCP proxy to the destination site，This avoids[……]
All to known，I want to get them abroad towards LAN DNS information，Will certainly suffer keywordPollution。to this end，Some people thinkUse exception port，For example, instead of using 5353 as the current DNS dedicated port 53-- Girl Friend Wall Only 53 pollution；It was also thought of using a TCP connection request，Because DNS response mechanism（参考 DHCP）I decided itResponse to accept a return of，Behind will be discarded，The use of TCP is forced to accept the selected data packets；Some people even thought of those made pollution[……]