Questions tagged [ubuntu-16.04]

Ubuntu 16.04 - named "Xenial Xerus" - is a Long Term Support (LTS) release of Ubuntu Linux. Officially released on April 21, 2016, it will be supported for 5 years. Only use this tag if your question is version-specific.

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Failed to display ens5 interface

I performed the interface name change, but now it no longer appears in the system. My config interface ifconfig When running /etc/init.d/networking restart i recive: restarting networking (via ...
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Why is sendmail only logging internal messages to /var/log/mail?

I'm pretty sure that in the past my sendmail (triggered from PHP) was logging messages sent from PHP to the MTA and also MTA to the recipient. Although emails are received by the recipient and I can ...
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How to use 1 ip to receive connections, and another to establish connections

I have a VPS with 2 usable IP addresses. I would like to use one of them to receive connections on, and use the other when the server is establishing a connection. So if the starter of the connection ...
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Ubuntu upgrade OS from 16.04.7 to newer OS version [closed]

I have problem with Ubuntu 16.04.7 LTS. I need to upgrade OS to 18.04 or 20.04. But I cannot: sudo do-release-upgrade always retrun: No new release found I tried to change /etc/update-manater/release-...
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Ubuntu set hostname via hostnamectl with multiple virtual hosts

I would like to set the hostname of my Ubuntu 16.04 to a FQDN, as I plan to install Postfix server. However I have multiple domains hosted in the web server via Apache2 virtual hosts. For example: ...
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Apache2 stopped working after upgrade to v2.4 ((38)Function not implemented: AH00141)

I was happily running apache2 and mysql on a Ubuntu 16.04 server with no problems, but yesterday I noticed that there were a bunch of updates available and I installed them using apt-get. One of the ...
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How to troubleshoot a systemd timer on Ubuntu 16.04 that won't re-schedule every minute as expected?

I have an existing systemctl target that was originally (by default installation) scheduled to run everyday, almost continuosly with just a pause of 30 seconds between the end and beginning of each ...
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/etc/ directory overwritten by mistake in Ubuntu

I've a running (installed fresh) Ubuntu 16 server. By mistake I've overwritten /etc/ directory with old backup of earlier server. As of now all seems to be working fine, unless some server(Postfix, ...
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Why am I no longer able to reconnect to remote server

I worked fine on a remote server (ubuntu-16.04), and when I ran the command from https://github.com/ubuntu/microk8s/issues/408 to fix a bridging problem in microk8s (kubernetes) I fell into a bigger ...
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When port is not blocked why UFW block message

Why am I getting Port 8000 blocked messeges in syslog given ufw status shows that 8000 is allowed: To Action From -- ------ ---- 22 ...
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Websocket connection delay from Mobile App to Ubuntu 16

I've customers with Android mobiles with my app which forwards selective SMS to a Nodejs based Websocket server on Ubuntu 16. I've two set of customers and another similar Ubuntu 14 with similar app ...
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Dell server with NIC that won't show link up

I have a dell server (PowerEdge R330) and I have just tried to liven up the second on board NIC. idrac says it is connected as does poking into the lifecycle setup on boot but ethtool says it isn't ...
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SFTP hangs when listing a large directory from a Windows Server 2012R2 VM

I have two machines on the same ethernet network segment: VM running Windows Server 2012R2 [sftp client] Physical server running Ubuntu 16.04.7 LTS [sftp server running openssh-server 1:7.2p2-...
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ODOO 10 Page wasn't loaded completely

Since a few days I can't access my ODOO instance from the external network. The home page doesn't load completely if I use a public IP address, only the logo loads. I searched in google and I found ...
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Daily cron running, But can't find file

I wrote simple shell script for backup mysql and send it to my email few months ago, It works very well even now, I can get packed sql file on my mailbox everyday. Today I am going to change mail ...
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ufw blocking certain traffic on web server that ought to be allowed

In an Ubuntu 16.04 machine hosting an internet-facing web application, my /var/log/syslog is being flooded by messages of the sort: Jan 9 17:41:50 ip-172-31-11-100 kernel: [483324.699896] [UFW BLOCK] ...
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Why apache2 ocuppied too many memory and took a long time to release the memory?

I have installed ubuntu 16.04 with 16GB Memory and 8 CPU. When I start an apache program, it occupied lots of Memory and took long time to release. For example, start the program first time, the ...
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ens33 broadcast multicast .. and ifconfig show only lo

after installing ubuntu 16.04 on vmware when i type the command ifconfig it only displays the lo interface and the command ifconfig -a displays : lo and ens33 broadcast multicast mtu 1500 qdisc noop ...
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On Google Cloud, what is the most cost-effective VM configuration for Ubuntu 16.04 + Anaconda Python + Jupyter Notebook + GUI via VNC?

I will use this VM for personal learning purposes, ~4 hours per day. For now I don't want to use GCP services like AI Platform Notebooks and others. I want to install all applications directly on the ...
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EC2 cannot access to EFS

Our website has mounted on 4 EC2 and 1 EFS. Sometimes EC2 servers cannot access to EFS. When I run commands like cd and ls, they are not responding when access is not available. When I restart the ...
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Set the limit of sent / received packets

My vps server provider limits me to 50,000 packets per second. After exceeding the number of packets, the link speed slows down to 1Mbit / s. Is it possible to set the ubuntu system not to exceed 50,...
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Can access ssh, cannot access from browser

straight to the question, i was been provided a server by our clients with ip x.x.x.x port 2215 to access it by ssh. Therefore i upload all my website to /var/www/html folder. Because i lack of ...
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NFS mount on housing user home shares not mounting on Ubuntu 16.04

The issue I am trying to resolve is a bit of a head-scratcher. I say that because the issue is consistently inconsistent and not happening on all of the Ubuntu 16.04 VMs that are hosted in our ESXi ...
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Apache status “150 requests currently being processed, 0 idle workers”

My Apache Server Scoreboard Status is as shown below when the "150 requests currently being processed, 0 idle workers" condition is hit. --Log-trace--- Apache Server Status for localhost (...
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Apache | redirect with Self-Signed SSL Certificate not working

OS: Ubuntu 16.04 I'm trying to enable a self-signed certificate for apache. I already created the certs with the following command: sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /...
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138 views

How to block HTTPS to IP with iptables and Fail2Ban using X-Forwarded-For

We have an AWS EC2 instance running behind a standard ELB load balancer. Is it possible for iptables to block HTTPS access from certain IPs, using the X-Forwarded-For IP address header info? This rule ...
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25 views

How to run updates on Ubuntu command line without upgrading PHP

I run an Ubuntu server on 16.04 using LAMP stack. I ran into an issue last week when updating using: sudo apt update Basically PHP was automatically upgraded from 7.4 to 8.0 during the upgrade &...
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How to disable Sendgrid mail relay on Postfix

I have a Sendgrid account, and have setup Sendgrid to work with my Postfix mail server. However, I would like to disable Sendgrid as a mail relay. I followed this article to set up: https://serverok....
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BigBlueButton getting unusaul traffic

We are running a bare-metal server which can handle 400 concurrent video conferencing users. We are using BigBlueButton application for video conferencing. It was running smoothly for the past 6 ...
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Ubuntu 16.04 server loses default route on restart

One of my Ubuntu servers always loses its default route when restarted. I have a second server which has an almost identical set up which works fine. I am not sure when the problem started but it ...
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ubuntu only use 8 cpu for RX and TX queue with vmxnet3

I installed Ubuntu 16.04 on vmware esxi 6.7 with 32 core cpu for this machine. Linux only run 8 queue for tx and rx and it cant use all cpus in heavy load. # ethtool -S ens192 | grep Queue Tx Queue#: ...
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1answer
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2 address on 1 server dont ping

enter image description here ifconfig enter image description here interface I have a problem, I would like to add 2 addresses to my server, but when I add it to interfaces, it shows up in ifconfig ...
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External DB do not accept full access user. Can't Manage Magento 2

My store is in AWS lightsail largest server tier. Exported DB from localserver to its own external server, connect with M2 = works like a charm. Later wanted to install an extension and when type in ...
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Cleaning and upgrading legacy infrastructure

I am a fullstack engineer in a small company, and I am responsible for everything related to technology, from infrastructure, to code. I arrived a few months ago, and quickly realised that there were ...
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1answer
963 views

When does ZFS “autoreplace” take effect?

Background autoreplace is documented like the following: autoreplace=on | off Controls automatic device replacement. If set to "off", device replacement must be initiated by the ...
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196 views

MySQL shows lot of connections

I checked my MySQL process list using "show processlist;"and it is showed nothing, But I used "show status like 'Conn%';" to check the connections and it is showed me around 9K ...
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369 views

Trying to Install Kubernetes with Vagrant and Ansible on Ubuntu 16.04 lab

So I am trying to install Kubernetes on a lab with Vagrant and Ansible. I am using the following documentation on Ubuntu 16.04: https://kubernetes.io/blog/2019/03/15/kubernetes-setup-using-ansible-and-...
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Enable ubuntu linux server cache with Apache

good morning. I need help with something. Today I use a Ubuntu 16.04 linux server and I'm trying to enable caching on my server in order to increase the Google Page Speed score. But I could not. On ...
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Get rid of content ripping bots in a Rails 4 app served by Nginx using Passenger on Ubuntu 16.04

Our rails app is being inundated with requests from bots that are trolling using IP addresses. Every request results in an exception notification error message. Our original Nginx server block: server ...
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How to create GCE machine image without including unmounted disks?

I created a machine image on GCE from a running ubuntu VM which has an "additional" disk available to be mounted. That disk is mounted for backups, then dismounted, and was not mounted at ...
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1answer
77 views

Can't set open files limit for user www-data and process PHP in ubuntu 16.04

I am having trouble setting the open files limit for user www-data and process PHP in Ubuntu 16.04. I have set all the following to 65535: /proc/sys/fs/file-max /etc/sysctl.conf /etc/security/limits....
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2k views

Install OpenSSL 1.1.1g in Ubuntu 16.04.06 LTS

I followed the instructions in https://cloudwafer.com/blog/installing-openssl-on-ubuntu-16-04-18-04/ but i get always an older openssl version when i run openssl version. In my case the 1.1.1e. It ...
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/etc/profile, /etc/bash.basrc, ~/.profile, ~/.bashrc are not read

I am a running "Ubuntu 16.04.6 LTS" Linux. I've installed/upgrade some packages, but i do not remember exactly which packages. Since this operation, i have lost ls coloration for all users ...
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257 views

Postfix Multi Instance - Test connect to secondary instance from external Email xlient to send emails

Problem: I'm trying to achieve sending and receiving Emails through the same server over domains email.domain1.us and email.domain2.net with authenticated users and being able to receive email as well....
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110 views

How to uninstall shorewall completely from Ubuntu

I noticed on my some servers shorewall service is installed but it's not running.I want to uninstall it. I executed the command sudo systemctl status shorewall to check status of shorewall and got the ...
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1answer
76 views

Apache cannot access server with port 80 [closed]

I have apache server running on Ubuntu 16.04 and which works fine with port other than 80, I have forwarded the port 80 and try to access my server using https://mysite.ddns.net/index.html and the ...
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687 views

Apache2 error AH00094 for mod_wsgi python application

Locally when I run my application as a "flask" application, it works just fine. On server I want to make it as an Apache + Mod WSGI application. I've installed Apache2 and python on ubuntu ...
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52 views

Can't block specific IP address with iptables, ubuntu 16.04

I'm trying to troubleshoot Fail2ban recognizing our http-get-dos trigger, but not actually banning the offending host. I can see it adding entries to iptables rules, but they don't have any affect. So ...
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1answer
87 views

How to upload files to remote server using curl on Ubuntu 18?

I have noticed that my application on Ubuntu 18 is not uploading files to remote server which was working ok on Ubuntu 16. When I do trace I see only one difference. Ubuntu 16: Content-Disposition: ...
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2answers
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Count requests from blocked IPs

Site on my server is being attacked using SQL injections. I block IP from which was attacked with command: # iptables -A INPUT -s ATTACK-IP-ADDRESS -j DROP Can I review activity of ATTACK-IP-ADDRESS ...

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