user938363's questions

logrotate was setup on Ubuntu 20.04 to limit the besu log file size to 10MB, keep 4 weeks log with rotating weekly and delete the old log file. Here is the besu conf:

#for besu log
/home/log/besu/* {
        size 10M
        missingok
        rotate 4
        weekly
        postrotate
                /usr/bin/find /home/log/besu/ -name "node*.log.*" -type f -mtime +0 -exec rm {}
\;
        endscript
}

The log file is named as node[1-4].log. Here is the ls output:

As the output shows, there are 18 files started with node1 and the file size is 1.6GB. It seems that none of the above conf goal has been achieved. What is missing in the log conf file?

I just setup up a vsftpd ftp server on 20.04 with anonymous login for download only/not allowing user to change root dir. When trying to ftp server-ip, received an error:

500 OOPS: vsftpd: cannot locate user specified in 'ftp_username':ftp
Connection closed by remote host.

Since this is anonymous ftp server, I am not sure where this ftp_username coming from. Here is the /etc/vsftpd.conf:

listen=NO
listen_ipv6=YES
# Allow anonymous FTP? (Disabled by default).
anonymous_enable=YES
anon_root=/srv/ftp/
no_anon_password=YES
hide_ids=YES
local_enable=NO
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=ftp
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO

What is missing with the conf above?

A service is created and here is the ExecStart:

  ExecStart=/bin/sh -c "/home/admin/bin/besu/bin/besu --config-file=/home/admin/bin/besu_network/node1/config.toml"

This command start a service with sudo systemctl start my.service. Is there way to redirect the stdout to terminal console? The above script didn't do that and there is nothing on the console.

Here is the line to start a process in systemd service and save log to /var/log/besu:

 ExecStart=/bin/sh -c "$HOME/bin/besu/bin/besu --config-file=$HOME/bin/besu_network/node1/config.toml >> /var/log/besu/node1.log 2>&1"

However since the user does not have the write permission under /var/log and it throws error. How to give a sudo permission in the line above to create a log file, but not add the user to sudoer group?

4 systemd service is created to start 4 besu processes on ubuntu 20.04 server under /etc/systemd/system/besu. Here is the node1.service:

cjadmin@ibm-testbox:/etc/systemd/system/besu$ cat node1.service

[Unit]
Description=Besu Enterprise Ethereum java client
After=syslog.target network.target

[Service]
User=myuser
Group=myuser
Environment=HOME=/home/myuser
Type=simple
ExecStart=/bin/sh -c "/home/myuser/bin/besu/bin/besu --config-file=/home/myuser/bin/besu_network/node1/config.toml >> /var/log/besu/node1.log 2>&1"  #<<==start besu service with configuration in  config.toml
SuccessExitStatus=143
Restart=on-failure
RestartSec=10s

[Install]
WantedBy=multi-user.target

The others are node2.service to node4.service. After reboot the server, there is no log files under /var/log/besu/. Then I check the system log by dmesg | less and didn't find any error and didn't see logs for starting besu services as wll. What can be wrong for the systemd services failing to start? Where to see the error?

Update:

$ systemctl status /etc/systemd/system/besu/node1.service
Unit etc-systemd-system-besu-node1.service.mount could not be found.
$ systemctl status node1.service
Unit node1.service could not be found.

Used the following command to change timezone on 20.04:

 sudo timedatctl set-timezone PST  //PT has same error

But receiving error of invalid time zone or missing (strange!).

Did the following:

sudo apt-get install pst-utils

But the error is the same. What is the right way to install pacific time?

I have been working with nginx for some time and a little confused by multiple location where the nginx.conf scan be saved. I know the nginx.conf can be saved to 2 locations:

1. /etc/nginx/sites-available/default
2. /opt/nginx/conf/nginx.conf

Which location is better saving nginx.conf? Any difference with different location?

I installed ubuntu 16.04 desktop on USB flash drive and setup an autologin during installation. The PC boots up and auto login successfully before I performed some system update for video driver installation. Now the system boots up and presents a login screen with a different user name which there is no password associated with and can't be changed. I can hit ctrl+alt+F1 to switch to a terminal screen but can't start X window with startx.

My question is how to login with a different user name on login screen?

Here is the login screen. Needs to login with a user other than miner1.

Here is the output of the netstat command on ubuntu 14.04 server:

admin@ibm-testbox:~$ netstat -tulnp | grep 5432
(No info could be read for "-p": geteuid()=1000 but you should be root.)
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      -

It seems that the port 5432 is listening to tcp traffic on loopback. The server ibm-testbox is behind a firewall and port forwarding is used to route the public traffic to the server. But we still can not make connection to the postgres server:

PG::ConnectionBad (could not connect to server: Connection refused (0x0000274D/10061)

Is the port 5432 open?

Here is the script sqlite_backup.sh under $HOME/:

#! /bin/bash
now=$(date +%d)
echo "Welcome to Sqlite backup script"
sqlite3 /var/www/db/nbhydb.sqlite3 << EOF
.timeout 20000
.backup $HOME/nbhydb_backup_$now.sqlite3
EOF
echo "End of the script"

The script is tested by typing $HOME/sqlite_backup.sh and there is a backup file created under $HOME. Here is the cron job (crontab -e):

# m h  dom mon dow   command
5 * * * * $HOME/sqlite_backup.sh

Here is cron log under /var/log/syslog:

Feb  3 13:05:01 ibm-testbox CRON[8961]: (root) CMD ($HOME/sqlite_backup.sh)

The command is scheduled to run at 5th minute of every hour. However there is no backup file generated by the cron job. What we have missed? Thanks.

UPDATE:

cron job is modified to save the the execution error:

5 * * * * $HOME/sqlite_backup.sh > $HOME/backup.log 2>&1

After execution, the log is:

Welcome to Sqlite backup script
End of the script

There is no error at all in the log. However there is still no nbhydb_3_backup.sqlite3 found.

Nginx was installed on our ubuntu 12.04 server and we want to find the version. Here is what we did:

admin@ibm-testbox:/opt/nginx/sbin$ nginx -v
The program 'nginx' can be found in the following packages:
 * nginx-extras
 * nginx-full
 * nginx-light
 * nginx-naxsi
Try: sudo apt-get install <selected package>
admin@ibm-testbox:/opt/nginx/sbin$ nginx -V
The program 'nginx' can be found in the following packages:
 * nginx-extras
 * nginx-full
 * nginx-light
 * nginx-naxsi
Try: sudo apt-get install <selected package>

Then we were trying to find if nginx was running. Here is the output:

admin@ibm-testbox:/opt/nginx/sbin$ ps waux | grep nginx
root      7652  0.0  0.0  37560  1100 ?        Ss   Dec20   0:00 nginx: master process /opt/nginx/sbin/nginx
nobody    7653  0.0  0.0  38008  2316 ?        S    Dec20   0:00 nginx: worker process
admin  23376  0.0  0.0   9388   924 pts/0    S+   08:35   0:00 grep --color=auto nginx

The nginx was installed with PhusionPassenger module. Why nginx -v (-V) did not show version?

The newly re-installed 12.04.3 server has the same problem as it was before. The problem is that the server can not boot up by itself. Sometime it goes into blank and never come out. Sometime it shows boot menu and hung after Attached SCSI drive. In this case, we just need to type 'exit' to get to the login prompt. The problem is similar to the post below:

http://askubuntu.com/questions/109500/boot-issues-long-delay-then-gave-up-waiting-for-root-device

We found that under /boot/grub, there is no menu.lst. Is it normal to have no menu.lst under /boot/grub? If this is a problem, how to fix it? Thanks.

===grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd0,msdos1)'
  search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=2
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
        set gfxpayload="${1}"
        if [ "${1}" = "keep" ]; then
                set vt_handoff=vt.handoff=7
        else
                set vt_handoff=
        fi
}
if [ "${recordfail}" != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 3.8.0-29-generic' --class ubuntu --class gnu-linux --class gnu --class os {
        recordfail
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
        linux   /boot/vmlinuz-3.8.0-29-generic root=UUID=e17df6f9-8d08-4d85-be32-4049ad596c4e ro
        initrd  /boot/initrd.img-3.8.0-29-generic
}
menuentry 'Ubuntu, with Linux 3.8.0-29-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
        recordfail
        insmod gzio
        insmod part_msdos
        insmod ext2
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
        echo    'Loading Linux 3.8.0-29-generic ...'
        linux   /boot/vmlinuz-3.8.0-29-generic root=UUID=e17df6f9-8d08-4d85-be32-4049ad596c4e ro recovery nomodeset
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-3.8.0-29-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
        insmod part_msdos
        insmod ext2
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
        linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
        insmod part_msdos
        insmod ext2
        set root='(hd0,msdos1)'
        search --no-floppy --fs-uuid --set=root e17df6f9-8d08-4d85-be32-4049ad596c4e
        linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

We reinstalled the ubuntu 12.04 server after power outrage. After reinstallation, the server can not reboot on its own. Here is the current manual reboot procedure:

1. After reboot now, the server powers up. After boot up menu (top 2 are boot into regular or recovery mode), the server goes directly into blank screen and hung (keystroke does not matter).
2. Hit control-alt-delete to restart again. This time the server will pass the bootup menu and stops at attached scsi disk. After hitting enter, the server goes into prompt initramfs. After typing exit, the server will go to the login screen.
3. login.

What's wrong with the ubuntu 12.04 server and how to fix it? Thanks for help.

/var/log/boot.log

fsck from util-linux 2.20.1
fsck from util-linux 2.20.1
/dev/mapper/ubuntu--ibm-root: clean, 101595/8634368 files, 1177251/34523136 blocks
/dev/sda1: clean, 230/124496 files, 40645/248832 blocks
 * Starting CUPS printing spooler/server                                 [ OK ]
 * Starting load fallback graphics devices                               [ OK ]
 * Starting Userspace bootsplash                                         [ OK ]
 * Starting Send an event to indicate plymouth is up                     [ OK ]
 * Stopping load fallback graphics devices                               [ OK ]
 * Stopping Send an event to indicate plymouth is up                     [ OK ]
 * Stopping cold plug devices                                            [ OK ]
 * Stopping log initial device creation                                  [ OK ]
 * Starting configure network device security                            [ OK ]
 * Starting save udev log and update rules                               [ OK ]
 * Stopping save udev log and update rules                               [ OK ]
 * Stopping Userspace bootsplash                                         [ OK ]
 * Stopping OpenSSH server                                               [ OK ]
 * Starting OpenSSH server                                               [ OK ]
 * Starting Mount network filesystems                                    [ OK ]
 * Stopping Mount network filesystems                                    [ OK ]
 * Stopping Failsafe Boot Delay                                          [ OK ]
 * Starting System V initialisation compatibility                        [ OK ]
 * Starting set sysctls from /etc/sysctl.conf                            [ OK ]
 * Stopping set sysctls from /etc/sysctl.conf                            [ OK ]
 * Starting configure network device                                     [ OK ]
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
 * Starting AppArmor profiles                                                  [ OK ]
 * Stopping System V initialisation compatibility                        [ OK ]
 * Starting System V runlevel compatibility                              [ OK ]
 * Starting crash report submission daemon                               [ OK ]
 * Starting automatic crash report generation                            [ OK ]
 * Starting ACPI daemon                                                  [ OK ]
 * Starting save kernel messages                                         [ OK ]
 * Starting CPU interrupts balancing daemon          

We have set up an Ubuntu 12.04 LTS server for RoR. We did successfully install rvm and git. However installation failed with rvm for zlib and ruby 1.9.3. Here is the error log for $rvm install 1.9.3:

checking pthread.h presence... yes
checking for pthread.h... yes
checking for if make is GNU make... ./configure: line 17125: make: command not found

The problem seems to be with GNU Make. Any solutions to fix? Thanks so much.