Set up multi web server on a single VPS via ghost

First please refer to set up ghost on your VPS.
Set up ghost(a fully open source, hackable platform for building and running a modern online publication) on your google compute engine.

Set up ghost(a fully open source, hackable platform for building and running a modern online publication) on your google compute engine.

Refers:
https://docs.ghost.org/docs
https://ghost.org/

Ubuntu 16.04 is recommended as your server OS.

If you are first login into your blog server,
Please Create a New User and Give Super User Privileges as well.
$adduser <user>
$usermod -aG sudo <user>
$su - <user>

Install Pre-requisites:
$sudo apt-get update
$sudo apt-get upgrade
#nginx
$sudo apt-get install nginx
$sudo ufw allow 'Nginx Full'
$sudo apt-get install mysql-server
#Warning
During mysql installation, you will be prompted to create a root password. Please ensure that you actually specify a value for this, as leaving the root password blank will make Ghost-CLI unable to connect to the database.

#Adding swap memory if needed
If your system has less than 1GB memory, you may run into errors. To overcome this, configure a larger amount of swap memory:
$dd if=/dev/zero of=/var/swap bs=1k count=1024k
$mkswap /var/swap
$swapon /var/swap
$echo '/var/swap swap swap default 0 0' >> /etc/fstab

#nodejs
$curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash
$sudo apt-get install -y nodejs

#install ghost-cli
$sudo npm i -g ghost-cli

#install ghost
$sudo mkdir -p /var/www/ghost
$sudo chown [user]:[user] /var/www/ghost
$cd /var/www/ghost
$ghost install

#The CLI will asks you for the minimum required information.
Enter your blog Url:

This is the url your blog will be available at and must include the protocol. e.g http://myblog.com for HTTP or https://myblog.com for HTTPS.

If you want to setup SSL, your domain must already be pointing at your server. If your domain is ready and resolved, then you can enter the https version of your domain, and choose "yes" later when asked if you want to setup SSL.

If your domain is not yet ready, enter the http version of your domain and choose no when prompted about SSL. When your domain is resolved, you can run ghost config url [https domain] && ghost setup ssl to run the ssl setup.
Enter your MySQL hostname [localhost]:

This determines where your MySQL database can be accessed from. For the most cases the user installs MySQL on the same server, in this case use localhost (press [enter] to use the default value).
Enter your MySQL username:

Enter your MySQL username. If you have already created a mysql user, password and database with the correct credentials ready for Ghost, enter those details now. Else, enter root and your MySQL root password and Ghost will generate a custom MySQL user for you.
Enter your MySQL password: [hidden]

The password for the MySQL user you entered in the previous step.
Ghost database name:

Here you have to enter the name of your database. If you install multiple instances of ghost on your server you need to specify a different database for each instance. If the database you entered does not exist already and you provided your root credentials it will be created for you.

If you pass a non-root MySQL username and password, this database must already exist and your user must have privileges for this database.
Do you wish to set up a ghost MySQL user?

If you provided your root MySQL user, Ghost CLI can create a custom MySQL user that can only access/edit your Ghost database. This is recommended, and Ghost-CLI takes care of this for you if you accept.
Do you wish to set up nginx?

Sets NGINX up for your blog enabling it to be viewed by the outside world. You can optionally set this up yourself.
Do you wish to set up ssl?

If you do not already have a valid ssl certificate installed for your blog and wish to use secure protocol, Ghost-CLI can take of this for you using the Let's Encrypt certification service. Otherwise you have to setup ssl by your own.

Your domain must have resolved to your server in order for the SSL setup to work. If you choose no now, you can run ghost setup ssl later to rerun this step.
Enter your email (used for SSL certificate generation)

This is required for SSL certification so that you can be kept informed if there is any issue with your certificate such as requiring renewal.
Do you wish to set up systemd?

systemd is the recommended process manager tool for keeping Ghost running. Choose yes to have it configured for you, or no if you're happy setting up process management yourself.
Do you want to start Ghost?

Choose whether you want to have Ghost running right away.

#Once install done, let's start your blog.
$ghost  start

Then you can open your blog url via any web browser. e.g. my blog:
https://errong.win

You can login into your ghost blog via https://[blogurl]/ghost
e.g. my blog ghost admin area.
https://errong.win/ghost

Set up proxy server on your google compute engine via squid

Install squid
    sudo apt install squid3
   
Install apache utils
    sudo apt-get install apache2-utils
    This Installs the htpasswd utility that allows for creating password files.
   
Copy the default configuration file to back it up.
    This configuration file is ridiculously huge and has way more than any simple case would need.  We will just back it up and make a new one with only the information that we need.
    sudo cp /etc/squid/squid.conf /etc/squid/squid.conf.original
       
Delete the old configuration file
    sudo rm /etc/squid/squid.conf

Make a new configuration files
    sudo vi /etc/squid/squid.conf
   
Enter this in the config file
    auth_param basic program /usr/lib/squid/basic_ncsa_auth /etc/squid/passwords
    auth_param basic realm proxy
    acl authenticated proxy_auth REQUIRED
    http_access allow authenticated

    # Choose the port you want. Default is 3128, but we set it to 7777
    http_port 7777
    The first bit (4 lines) sets squid to require passwords
    The last bit configures squid to use port 7777.  You can change this to anything you want.
    Save the file in vi with [esc]:wq
   
Set up the username and password
    sudo htpasswd -c /etc/squid/passwords [username]
    Replace [username] with any username you want to use
    You will be asked to enter and reenter a password for the username that you entered.  make sure they match.
   
Restart the squid service
    sudo systemctl restart squid.service

The last step, please not forget to set up a new firewall rule for http_port

 四种结果

         “这比喻乃是这样：种子就是神的道。 那些在路旁的，就是人听了道，随后魔鬼来，从他们心里把道夺去，恐怕他们信了得救。 那些在磐石上的，就是人听道，欢喜领受，但心中没有根，不过暂时相信，及至遇见试炼就退后了。 那落在荆棘里的，就是人听了道，走开以后，被今生的思虑、钱财、宴乐挤住了，便结不出成熟的子粒来。 那落在好土里的，就是人听了道，持守在诚实善良的心里，并且忍耐着结实。” (路加福音 8:11-15 和合本)

        Now the parable is this: The seed is the word of God.Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.And that which fell among thorns are they, which, when they have heard, go forth, and are choked with cares and riches and pleasures of this life, and bring no fruit to perfection.But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience. (Luke 8:11-15 KJV)

        在听道的人群中，有一些人是属于第一种情况，如文士们，他们心里早已有了自己的主张，魔鬼早已把很多错误的道理塞在他们的心里，使他们把这些错误的道理当作正确的，他们用他们所相信的，所以为的这些道理，去判断一切，以至于真理根本无法进入他们的心。今天，有人以为无神论是正确的，有人认为佛教的理论是正确的，也有人笃信可兰经的理论，所以他们的心再也没有办法听见别的。魔鬼就是那迷惑人的，把错误的道理充满人的心，目的就是为了抵挡圣经的真理，这就是飞鸟来吃尽了的现象。

        也有一些人，他们听了道，情感上愿意接受，很兴奋，但是并没有让主的道深深地进入他们的心里，也没有把自己的生命真正的交托主。他们觉得这道很好，就接受了，一旦为主的道遭遇艰难和痛苦，他们马上就退后了，这是第二种情况！

       第三种情况是，他们觉得主很好，也愿意接受相信，但是他们放不下这个世界，各种各样的思虑、钱财等等的迷惑，以致他们不能够真心的跟随主！就像那个来找主的少年财主，最后因着放不下钱财，忧忧愁愁地走了。

        而最后一种人，就像彼得保罗这些人，他们有一个诚实的心，听见主的道，蒙了光照后，就接受耶稣基督作他们的救主。既是真理，他们就不顾一切地跟随，不管遇到多少艰难险阻，也跟随到底，以至于结果累累，这就是最后一种田地。

 用比喻的目的

        门徒问耶稣说：“这比喻是什么意思呢？” 他说：“　神国的奥秘只叫你们知道；至于别人，就用比喻，叫他们看也看不见，听也听不明。” (路加福音 8:9-10 和合本)

        And his disciples asked him, saying, What might this parable be?And he said, Unto you it is given to know the mysteries of the kingdom of God: but to others in parables; that seeing they might not see, and hearing they might not understand. (Luke 8:9-10 KJV)

         耶稣用一些普通的言论作为起头，来答复门徒对这个故事的询问。祂把门徒跟其他人作比较：特别强调你们。神国的奥秘是启示给他们的。真秘（mystēria)是那些我们自己永远无法发现，但神已经将之启示出来的真理；这个字在保罗书信中很常见，但在福音书中却只出现在与此有关的经文中。但至于别人，看却看不见，听也听不明；他们听见了比喻，却不明白它们的意义。比喻启示了真理，同时也把真理隐藏起来：它们把真理向诚心寻求的人启示出来，他们不厌其烦的在表面底下挖掘，发现其意义；但它们也把真理向那只以听听故事为满足的人隐藏起来。这很明显是比喻的结果，但耶稣却说这也是它们的目的（叫……）。对那些认真的人而言，比喻是知识的矿场；但对那些随随便便、漫不经心的人来说，它们是个审判。求主怜悯我们，让我们成为谦卑跟随主的人，因为主向谦卑跟随他的人就显出来，向骄傲的人就藏起来，所以我们要不断地求主保守我们的心，始终有一颗谦卑受教寻求的心。

Hey, ghost my blog, https://errong.win

Hey, ghost my blog!
https://errong.win

How to fix up sendgrid-python, BadRequestsError

Traceback (most recent call last):
  File "sendmail.py", line 79, in <module>
    response = sg.client.mail.send.post(request_body=mail.get())
  File "/home/errong_leng/.local/lib/python2.7/site-packages/python_http_client/client.py", line 227, in http_request
    return Response(self._make_request(opener, request))
  File "/home/errong_leng/.local/lib/python2.7/site-packages/python_http_client/client.py", line 161, in _make_request
    raise exc
python_http_client.exceptions.BadRequestsError

The easy way is to catch this exception and print out the error body:
try:
    response = sg.client.mail.send.post(request_body=mail.get())
    print(response.status_code)
    print(response.body)
    print(response.headers)
except Exception as e:
    print (e.body)  #print (e.read()) 

Then you can know why bad request error reported, such as:
{"errors":[{"message":"Following RFC 1341, section 7.2, if either text/html or text/plain are to be sent in your email: text/plain needs to be first, followed by text/html, followed by any other content.","field":"content","help":null}]}

{"errors":[{"message":"The subject is required. You can get around this requirement if you use a template with a subject defined or if every personalization has a subject defined.","field":"subject","help":"http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.subject"}]}

{"errors":[{"message":"Each email address in the personalization block should be unique between to, cc, and bcc. We found the first duplicate instance of [errong.leng@gmail.com] in the personalizations.0.to field.","field":"personalizations.0","help":"http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.recipient-errors"}]}