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Hi,
I am using serverpilot. 512 MB swap memory is filled with inactivate pages. I want to know how to free swap memory?
1) How to clear this ?
2) How to increase Swap memory?
3) I need to login as root or serverpilot?
This question was answered by @saurabh:
Hey, here is an article that might help you:
https://www.digitalocean.com/community/questions/how-to-change-swap-size-on-ubuntu-14-04
I accidentally typed root@xxxxx:/var/www/html/xxxxx.com/listimages# sudo chown -R www-data:www-data /. How do I restore the file permission? I got this error whenever I try to use sudo --- sudo: error in /etc/sudo.conf, line 0 while loading plugin `sudoers_policy' sudo: /usr/lib/sudo/sudoers.so must be owned by uid 0 sudo: fatal error, unable to load plugins --- withou it I cant change owneship.
I upgraded some of my software and since then my postfix dovecot mysql setup that was working perfectly (following[ this tutorial](https://www.digitalocean.com/community/tutorials/how-to-configure-a-mail-server-using-postfix-dovecot-mysql-and-spamassasin)) is broken... I am currently running the following on my droplet: * Ubuntu 14.04.2 LTS Release: 14.04 Codename: trusty * Postfix 2.11.0 * mysql 14.14 Distrib 5.6.23-72.1, for debian-linux-gnu (x86_64) using EditLine wrapper (Percona version) * dovecot 2.2.9 I can connect to mysql, and both postfix and dovecot are running. For some reason it appears that postfix cannot connect to the mysql server, even though the user and password work when I access the database directly. The error seems to be reflected by these repeating warnings in the postfix log file: (the hostname and username were changed for privacy) ``` <lots of stuff deleted> Mar 8 18:25:58 hostname postfix/cleanup[31858]: warning: connect to mysql server 127.0.0.1: Lost connection to MySQL server at 'reading initial communication packet', system error: 0 Mar 8 18:25:58 hostname postfix/cleanup[31858]: warning: mysql:/etc/postfix/mysql-virtual-alias-maps.cf lookup error for "username@hostname" Mar 8 18:25:58 hostname postfix/cleanup[31858]: warning: 149EB1845F3: virtual_alias_maps map lookup problem for username@hostname -- message not accepted, try again later <lots of stuff deleted> ``` When I change the .cf files that define the mysql connections and use "localhost" instead of "127.0.0.1" the error message changes to: ``` <lots of stuff deleted> Mar 8 18:30:52 hostname postfix/cleanup[32254]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) Mar 8 18:30:52 hostname postfix/cleanup[32254]: warning: mysql:/etc/postfix/mysql-virtual-alias-maps.cf lookup error for "username@hostname" Mar 8 18:30:52 hostname postfix/cleanup[32254]: warning: 0A28C1845F3: virtual_alias_maps map lookup problem for username@hostname -- message not accepted, try again later <lots of stuff deleted> ``` Any thoughts how to troubleshoot this further? I have tried pretty much everything for the last six hours but don't seem to have any success. I posted this to the entry that provides the tutorial, but thought this area might have a bit more traffic... Thanks for your input! Andreas
First , I like to thank DigitalOcean for their No nonsense straight to the point tutorials on how to setup everything about VPS linux , to get one with no experience like me to get my site up and running. also , I do not have a digitalocean Droplet yet , as i learned about this site trying to manage VPS from other provider. so I hope someone can also help me with my question. As per all tutorials here . I setup Vhost for a domain by creating folder in /var/ww/USER/public_html. this works just fine. Also from tutorial here , i setup VSFTPD .. and i added ftp folder to /home/USER/ftp . this works as well . however, as a ftp user i have no access to my public_html folder . after upload , i have to use command line to move files from ftp folder to my public_html. wouldn't be much easier to create public_html and Ftp folders under /home/USER account ? I come from shared hosting plans , looking at the structure of my folder, i noticed this is how they created all my folders when i joined. /home/User/public_html /home/User/public_ftp /home/User/email etc... Can anyone tell me what is the benefit of going this direction and if doing this would allow ftp user access to public_html for file management. Thank you so much.
I have followed the guide here (https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-as-a-web-server-and-reverse-proxy-for-apache-on-one-ubuntu-16-04-server) While they are using Ubuntu we are using Centos 7.2. Going directly to apache on port 8080 or 8443 (ssl) works. Pulling static files from Nginx works as well on port 80 and 443. However once the configuration is updated to use pass php traffic to apache I get 502 Bad Gateway. I Nginx Config ``` server { listen 80; listen 443 ssl; server_name www.domain.com domain.com; ssl on; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_ciphers ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!eNULL:!NULL:!DH:!EDH:!AESGCM; ssl_session_cache shared:SSL:5m; ssl_session_timeout 10m; ssl_prefer_server_ciphers on; ssl_certificate /etc/nginx/ssl/domain_com.pem; ssl_certificate_key /etc/nginx/ssl/domain_com.key; root /data/web/corp/domain; index index.php index.htm index.html; location / { try_files $uri $uri/ /index.php; } location ~ \.php$ { proxy_pass https://127.0.0.1:8443; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; } location ~ /\. { deny all; } } ``` I have tried to set the proxy_pass to the internal IP, Public IP, domain name, and loopback ip. Seems to all be the same issue. Apache is set to listen on 8080 and 443. The Nginx error logs show this: ``` 2017/03/14 23:07:52 [error] 24934#0: *306 upstream prematurely closed connection while reading response header from upstream, client: 71.25.9.17, server: www.domain.com, request: "GET / HTTP/1.1", upstream: "https://127.0.0.1:8443/index.php", host: "www.domain.com" ``` Apache SSL error log: ``` [Tue Mar 14 23:12:36.955268 2017] [ssl:error] [pid 63873] [client 127.0.0.1:45822] AH02261: Re-negotiation handshake failed: Not accepted by client!?, referer: https://www.domain.com/favicon.ico ``` Apache SSL access log: ``` 127.0.0.1 - - [14/Mar/2017:23:12:16 +0000] "GET /index.php HTTP/1.0" 403 211 ``` I am not sure where to start as I am new to Nginx but from my reading it seems to be much better/faster at serving up static content than Apache. While our development group currently requires .htaccess we have to keep using Apache.
Hey, here is an article that might help you:
https://www.digitalocean.com/community/questions/how-to-change-swap-size-on-ubuntu-14-04