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managing swap

This commit is contained in:
yalh76 2019-08-11 00:20:48 +02:00
parent 5c325134b1
commit 1e9663438e
3 changed files with 117 additions and 10 deletions

View file

@ -10,6 +10,7 @@ source _common.sh
source ynh_install_ruby
source ynh_add_extra_apt_repos__3
source ynh_send_readme_to_admin__2
source ynh_add_swap
source /usr/share/yunohost/helpers
#=================================================
@ -44,16 +45,6 @@ ynh_script_progression --message="Validating installation parameters..." --weigh
final_path=/var/www/$app
test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
if [ ${PACKAGE_CHECK_EXEC:-0} -eq 1 ]; then
# TODO : to be factorized into a helper someday ? ;)
MEM=$(free | grep "^Mem" | awk '{print $2}')
SWAP=$(free | grep "^Swap" | awk '{print $2}')
TOTAL_MEM_AND_SWAP=$(( ( $MEM+$SWAP ) / 1024 )) # In MB
[[ $TOTAL_MEM_AND_SWAP -gt 2500 ]] || ynh_die "You need at least 2500 Mo of RAM+Swap to install Mastodon. Please consult the README to learn how to add swap."
fi
# Register (book) web path
ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
@ -133,6 +124,22 @@ ynh_system_user_create --username=$app --home_dir=$final_path
#=================================================
# SPECIFIC SETUP
#=================================================
# ADD SWAP IF NEEDED
#=================================================
total_memory=$(ynh_check_ram)
total_swap=$(ynh_check_ram --only_swap)
swap_needed=0
if [ $total_memory -lt 2560 ]; then
# Need a minimum of 8Go of memory
swap_needed=$((2560 - $total_memory))
fi
ynh_script_progression --message="Adding $swap_needed Mo to swap..." --weight=1
ynh_add_swap --size=$swap_needed
#=================================================
# INSTALLING RUBY AND BUNDLER
#=================================================

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@ -9,6 +9,7 @@
source _common.sh
source ynh_install_ruby
source ynh_add_extra_apt_repos__3
source ynh_add_swap
source /usr/share/yunohost/helpers
#=================================================
@ -101,6 +102,12 @@ ynh_remove_nginx_config
# Remove a cron file
ynh_secure_remove --file="/etc/cron.d/$app"
# Remove swap
ynh_del_swap
# Remove swap
ynh_del_swap
#=================================================
# GENERIC FINALIZATION

93
scripts/ynh_add_swap Normal file
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@ -0,0 +1,93 @@
#!/bin/bash
# Add swap
#
# usage: ynh_add_swap --size=SWAP in Mb
# | arg: -s, --size= - Amount of SWAP to add in Mb.
ynh_add_swap () {
# Declare an array to define the options of this helper.
declare -Ar args_array=( [s]=size= )
local size
# Manage arguments with getopts
ynh_handle_getopts_args "$@"
local swap_max_size=$(( $size * 1024 ))
local free_space=$(df --output=avail / | sed 1d)
# Because we don't want to fill the disk with a swap file, divide by 2 the available space.
local usable_space=$(( $free_space / 2 ))
SD_CARD_CAN_SWAP=${SD_CARD_CAN_SWAP:-0}
# Swap on SD card only if it's is specified
if ynh_is_main_device_a_sd_card && [ "$SD_CARD_CAN_SWAP" == "0" ]
then
ynh_print_warn --message="The main mountpoint of your system '/' is on an SD card, swap will not be added to prevent some damage of this one, but that can cause troubles for the app $app. If you still want activate the swap, you can relaunch the command preceded by 'SD_CARD_CAN_SWAP=1'"
return
fi
# Compare the available space with the size of the swap.
# And set a acceptable size from the request
if [ $usable_space -ge $swap_max_size ]
then
local swap_size=$swap_max_size
elif [ $usable_space -ge $(( $swap_max_size / 2 )) ]
then
local swap_size=$(( $swap_max_size / 2 ))
elif [ $usable_space -ge $(( $swap_max_size / 3 )) ]
then
local swap_size=$(( $swap_max_size / 3 ))
elif [ $usable_space -ge $(( $swap_max_size / 4 )) ]
then
local swap_size=$(( $swap_max_size / 4 ))
else
echo "Not enough space left for a swap file" >&2
local swap_size=0
fi
# If there's enough space for a swap, and no existing swap here
if [ $swap_size -ne 0 ] && [ ! -e /swap_$app ]
then
# Preallocate space for the swap file, fallocate may sometime not be used, use dd instead in this case
if ! fallocate -l ${swap_size}K /swap_$app
then
dd if=/dev/zero of=/swap_$app bs=1024 count=${swap_size}
fi
chmod 0600 /swap_$app
# Create the swap
mkswap /swap_$app
# And activate it
swapon /swap_$app
# Then add an entry in fstab to load this swap at each boot.
echo -e "/swap_$app swap swap defaults 0 0 #Swap added by $app" >> /etc/fstab
fi
}
ynh_del_swap () {
# If there a swap at this place
if [ -e /swap_$app ]
then
# Clean the fstab
sed -i "/#Swap added by $app/d" /etc/fstab
# Desactive the swap file
swapoff /swap_$app
# And remove it
rm /swap_$app
fi
}
# Check if the device of the main mountpoint "/" is an SD card
#
# [internal]
#
# return 0 if it's an SD card, else 1
ynh_is_main_device_a_sd_card () {
local main_device=$(lsblk --output PKNAME --noheadings $(findmnt / --nofsroot --uniq --output source --noheadings --first-only))
if echo $main_device | grep --quiet "mmc" && [ $(tail -n1 /sys/block/$main_device/queue/rotational) == "0" ]
then
return 0
else
return 1
fi
}