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--- linux:digitalocean [2014/12/28 03:12] – [create swap file for your linux server] admin
+++ linux:digitalocean [2019/08/05 15:42] – [2. copy data from hostgator to Digitalocean] admin
@@ Line 1: / Line 1: @@
 ====== Moving web from hostgator to DigitalOcean ======
 ===== 1. Install missing components on DigitalOcean =====
 ==== install basic packages ====
 <code bash>
 yum install vim mc man telnet
+</code>
+==== create swap file for your linux server ====
+Most **cloud virtual machine providers do not set up swapfiles** as part of their server provisioning.
+If you are running the recommended 2 GB of memory for Discourse, a swap file is technically not required, but can be helpful just **in case your server experiences memory pressure.** With a swap file, rather than **randomly terminating processes with an out of memory error**, things will slow down instead.
+This can be done at any time from the command line on your server.
+Set up a 1 GB swap file
+Adding a swap file gives Discourse some extra breathing room during memory-intensive operations. 1GB swap should suffice, though if you are attempting the minimum memory configuration you should set up a 2GB swap.
+In the shell you have opened to your droplet, do the following:
+  - Step1: Check your swap on<code bash>
+swapon -s
+</code>
+  - Step2: Create an empty swapfile<code bash>
+sudo install -o root -g root -m 0600 /dev/null /swapfile
+</code>
+  - Step3: write out a 1 GB file named 'swapfile'<code bash>
+dd if=/dev/zero of=/swapfile bs=1k count=1024k
+</code>
+  - Step4: tell linux this is the swap file:<code bash>
+mkswap /swapfile
+</code>
+  - Step5: Activate it<code bash>
+swapon /swapfile
+</code>
+  - Step6: Add it to the file system table so its there after reboot:<code bash>
+echo "/swapfile       swap    swap    auto      0       0" | sudo tee -a /etc/fstab
+</code>
+  - Step7: Set the swappiness to 10 so its only uses as an emergency buffer<code bash>
+sudo sysctl -w vm.swappiness=10
+echo vm.swappiness = 10 | sudo tee -a /etc/sysctl.conf
 </code>
 ==== mysqld ====
@@ Line 25: / Line 60: @@
   </code>
-===== 2. copy data from hostgator to Digitalocean =====
+===== 2. Copy data from hostgator to Digitalocean =====
 ==== create backup file for web and database on Hostgator ====
 === backup web ===
@@ Line 37: / Line 72: @@
 </code>
 ==== copy data to Digitalocean with scp ====
+(To run scp, you must install openssh-clients both client and server)
   * check ssh connect: <code bash>
   ssh -p 2222 [email protected]
-  </code>
+</code>
   * scp<code bash>
   scp -P 2222 [email protected]:~/public_html/babyshopvn.tar.gz .
   scp -P 2222 [email protected]:~/babyshopvn.sql .
-  </code>
+</code>
 ===== 3.Import database and config to run web on DigitalOcean =====
 ==== Import database ====
   * create database:<code bash>
   mysqladmin create babyshopvn;
-  </code>
+</code>
   * Import database:<code bash>
   mysql -f --default-character-set=utf8 -uroot babyshopvn < babyshopvn.sql
-  </code>
+</code>
 ==== config httpd ====
 === check location of httpd config file ===
@@ Line 97: / Line 133: @@
 </Directory>
 </code>
-=== Create Simple code in DocumentRoot to check ===
+=== create Simple code in DocumentRoot to check ===
 Create helloworld.php in /var/www/html
 <code php>
@@ Line 158: / Line 194: @@
   * secure user:<code bash>
 AllowUsers root anhvc
+</code>
+  * change usedns in sshd.conf<code>
+UseDNS no
 </code>
 ==== config php debug ====