ceilometer-api: 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-api - from package: ceilometer-api

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

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