ceilometer-expirer: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ceilometer-expirer - from package: ceilometer-common

You may install the required package with command apt-get install {package}

Error in other languages:
ceilometer-expirer: bevel nie gevind nie
ceilometer-expirer: comandă negăsită
ceilometer-expirer: comando não encontrado
ceilometer-expirer: commande introuvable
ceilometer-expirer: command not found
ceilometer-expirer: käsku ei ole
ceilometer-expirer: không tìm thấy lệnh
ceilometer-expirer: komanda nerasta
ceilometer-expirer: Kommando nicht gefunden.
ceilometer-expirer: kommandot finns inte
ceilometer-expirer: komut yok
ceilometer-expirer: nie znaleziono polecenia
ceilometer-expirer: níor aimsíodh an t-ordú
ceilometer-expirer: no se encontró la orden
ceilometer-expirer: no s'ha trobat l'ordre
ceilometer-expirer: opdracht niet gevonden
ceilometer-expirer: parancs nem található
ceilometer-expirer: perintah tidak ditemukan
ceilometer-expirer: príkaz nenájdený
ceilometer-expirer: příkaz nenalezen
ceilometer-expirer: команда не найдена
ceilometer-expirer: командата не е открита
ceilometer-expirer: 命令找不到
ceilometer-expirer: コマンドが見つかりません